Erica

This page lists questions and answers that were posted by visitors named Erica.

Questions

The following questions were asked by visitors named Erica.

the spread of oil leaking from a tanker is in the shape of a circle. If the radius r (in feet) of the spread after t hours is r(t)= 200 square root of t, find the area A of the oil slick as a function of the time t. You know that the area of a circle is A...

The formula D= 5e ^-0.4h can be used to find the number of milligrams D of a certain drug that is in a patient's bloodstream h hours after the drug has been administered. When the number of milligrams reaches 2, the drug is to be administered again. WHat...

A culture of bacteria obeys the law of unlimited growth. If 500 bacteria are present initially and there are 800 after 1 hour, how many will be present in the cultrue after 5 hours? How long until there are 20,000 bacteria? Hmmm, what is "the law of unlim...

a 1.0 metal head of a geology hammer strikes a solid rock with a velocity of 5.0 m/s. Assuming all the energy is retained by the hammer head, how much will its temperature increase? (Chead=0.11 kcal/kg degrees C) 1/2 m v^2 = mc Deltatemp solve for deltaTe...

lead is a soft, dense metal with a specific heat of 0.028 kcal/kg degrees C, a melting point of 328.0 degrees C and a heat of fusion of 5.5 kcal/kg. How much heat must be provided to melt a 250.0 kg sample of lead with a temperature of 20.0 degrees Celsiu...

A 50.0 g silver spoon at 20.0 degrees Celsius is placed in a cup of coffee at 90.0 degrees C. How much heat does the spoon absorb from the coffee to reach a temp. of 89.0 degrees C? Rememeber this equation. It, or a slight modification of it, will work al...

waht is the impact of a stock repurchase on a companys debt ratio? Does this suggest another use for excess cash? The <b>correct subject in the subject line</b> will get you help in a more timely manner, and will aid in not wasting the time of other teach...

How do clouds form, and where in canada would you expect to see certain types of clouds. What is the difference between clouds and fog? http://en.wikipedia.org/wiki/Cloud

Why does covering and refrigerating food help reduce spoilage from mould?

What were the key arguments for and against U.S. imperialism during the Spanish American War??

How would I find the a for the equation y= a(x-h)^2+k. I'm looking at a graph, and I can solve for everything except for a. What is it supposed to be?

How do you write a quadratic equation in standard form for a given set of zeros?

Erik bicycles 32 km/h with no wind. Against the wind he bikes 33 km in the same time it takes to bike 63 km with the wind. What is the speed of the wind?

Erik bicycles 32 km/h with no wind. Against the wind he bikes 33 km in the same time it takes to bike 63 km with the wind. What is the speed of the wind? I don't understand any of the responses. You have to assume in this case the wind retards and assists...

find pH of 0.050 M HCLO4 plus 0.050 M HBr> You must consider activities>

Assume that men constitute 49% of population in a country. Assume also that among men there are 5% of color-blinded. Find the proba- bility that a person chosen at random is a color-blinded man.

This is my english assignment, hope someone will look over it for me!! Thanks Identify the phrase in the sentence below, and name the kind and function of each phrase. a)Having had a good season, they hoped to win the trophy. having had a good season: par...

I have did the corrections for my english homework I posted a few days ago. Can someone check it over again and give me some suggestion if they are still wrong. Thank you!! Identify the phrase in the sentence below, and name the kind and function of each...

Indicate the gendr of the bracketed words. I tired them but I am not sure am I right or not. Please look over it and give me suggestion if they are wrong. Thank you!! (They) told the (children) the (stories) they had heard (themselves). They - collective...

This is one of my english homework. Can someone have a look at it and give me some suqqestions. Thank you. The Summary of English Grammar defines the major word-classes in terms of meaning rather than structure. By references to any one of the major wordc...

This is a homework assignment for my Psychology course on Memory and learning. Find a Movie/video clip (1-3 mins)that demonstrate a concept / phenomenom relevant to learning and memory? My prof used Matrix (what we see is just our neuron firing) and Bourn...

Four charges on a rectangle that is 6 cm by 3 cm. All but one of the corners has a positive charge. The magnitudes of the charges are all 8.40e-12 C. What is the net electric field at the center of the rectangle?

The crystal structure of lithium sulfide (Li2S) is pictured here. The length of the unit cell is 5.88 x 10^2. For this structure, determine: a)the coordination number of Li and S b) the number of formula nunits in the unit cell c) the density of Li2S

5(2n + 4) - 3(4n - 6) = 2(20 - n) I solved this equation and this is what I got. 10n + 20 - 12n + 18 = 40 - 2n -2n + 38 = 40 -2n 38 ≠ 40 What does this mean? Thank you!

what is n/15=120

A stationary billiard ball, mass 0.17 kg, is struck by an identical ball moving at 2.7 m/s. After the collision, the second ball moves off at 60° to the left of its original direction. The stationary ball moves off at 30° to the right of the moving ball's...

What is a generalization for this set of polygons: square, hexagon and a pentagon

a description of a specific macroeconomic phenomenon or event and how it has impacted you

How do you find a formula for f(x) and g(x) if h(x)=f[g(x)] h(x)=(2x^3-5)^4

If today is Tuesday, what integer stands for last Sunday?

solve by elimination method 5x+2y=-13, 7x-3y=17

A bag of sugar weighs 4.00 lb on Earth. What would it weigh in newtons on the Moon, where the free-fall acceleration is one-sixth that on Earth? 1 N Repeat for Jupiter, where g is 2.64 times that on Earth. 2 N Find the mass of the bag of sugar in kilogram...

graph the inequality on a plane 3x+4y is less then or equal to 12

A 512 kg satellite is in a circular orbit about the Earth at a height above the Earth equal to the Earth's mean radius. (a) Find the satellite's orbital speed. (b) Find the period of its revolution. (c) Find the gravitational force acting on it.

A sample of blood is placed in a centrifuge of radius 20.0 cm. The mass of a red blood cell is 3.0 10-16 kg, and the magnitude of the force acting on it as it settles out of the plasma is 4.0 10-11 N. At how many revolutions per second should the centrifu...

What force is required to accelerate an object having a mass of 3 kg at 5 m/s2?

Use implicit differentiation to find dy/dx. ln xy + 5x = 30

Use the derivative to determine whether the function is strictly monotonic on its entire domain and therefore has an inverse function. f(x) = cos [(3x)/2]

Find the inverse of f(x) = (x+2)/x

You need 50 pounds of two commodities costing $1.25 and$1.60 per pound. a) Verify that the total cost is y=1.25x + 1.60(50 - x), where x is the number of pounds of the less expensive commodity. b) Find the inverse function of the cost function.

Find the derivative of the function. f(x) = arctan (x/a)

Find the integral of 2x/(x^2 + 6x + 13)dx

The graph of y = 3x^2 - x^3 has a relative maximum at what point?

If f(x) = e^(sin x), how many zeros does f '(x) have on the closed interval [0, 2π]?

How do you solve ∫sin(3x+4)dx? I got the -cos(3x+4) part, but do you have to integrate the 3x+4 too? Does chain rule apply?

If the integral of (x^2 - 2x + 2)dx from 0 to 6 is approximated by three inscribed rectangles of equal width on the x-axis, then the approximation is equal to what?

If dy/dx = x²y², then d²y/dx² = ?

Let f(x) be the function defined by f(x) = {x, x≤0 x+1, x>0 The value of the integral of x(f(x))dx from -2 to 1 =?

If, for all real number x, f(x) = g(x) + 5, then on any interval [a, b], what is the area of the region between the graphs of f and g?

Let f be the function given by f(x) = tan x and let g be the function given by g(x) = x^2. At what value of x in the interval 0≤x≤π do the graphs of f and g have parallel tangent lines?

t(sec) | 0 | 2 | 4 | 6 | 8 | ____________|_____|_____|_____|____|_____| a(t) (ft/sec²) | 2 | 3 | 4 | 3 | 2 | The table for the acceleration of a particle from 0 to 8 seconds is given in the table above. If the velocity at t=0 is 4 feet per second, the app...

The amount A(t) of a certain item produced in a factory is given by A(t) = 4000 + 48(t - 3) - 4(t - 3)³ where t is the number of hours of production since the beginning of the workday at 8:00 am. At what times is the rate of production increasing most rap...

The number of bacteria in a culture is increasing according to the law of exponential growth. There are 125 bacteria in the culture after 2 hours and 350 bacteria after 4 hours. a) Find the initial population. b) Write an exponential growth model for the...

A body of an unknown temperature was placed in a room that was held at 30°F. After 10 minutes, the body's temperature was 0°F, and 20 minutes after the body was placed in the room the body's temperature was 15°F. Estimate the body's initial temperature. T...

1. solve sqrt (11-x) = sqrt(x-7) choices are 6,7,8 or9 I think according to my calcs the answer is (9) The range of f(x) = sqrt(3x-6) - 2 answers would be y<= (-2) y>= (-2) y> (-2) y<=(2) I think the answer is y <= -2, correct I don't get this one at all:...

You push a 67 kg box across a floor where the coefficient of kinetic friction is uk = .55. The force you exert is horizontal. (a) How much power is needed to push the box at a speed of .50 m/s? (b) How much work do you do if you push the box for 35 s? *pl...

You throw a glove straight upward to celebrate a victory. Its initial kinetic energy is K and it reaches a maximum height H. What is the kinetic energy of the glove when it is at the height H/2?

Movement of bones in the skeletal system is made easier because of the existence of connections between bones called. JOINT Organs arranged in such a way that together they can perform a more complex function than can any one organ alone are called. SYSTE...

Urine passes from the bladder to the outside of the body through a tube called the .Urethra Muscles are attached to bones by structures called .Tendons Communication, integration, and control are the primary functions of two body systems called and . Nerv...

Various values for the derivative, f'(x), of a differentiable function f are shown below. x=1, f'(x) = 8 x=2, f'(x) = 4 x=3, f'(x) = 0 x=4, f'(x) = -4 x=5, f'(x) = -8 x=6, f'(x) = -12 If f'(x) always decreases, then which of the following statements must...

A rectangular box, with a square base and open at the top is to be constructed. If the volume of the box needs to be 108 cubic feet, what is the minimum surface area?

Given function f defined by f(x) = ( 1- x)³. What are all values of c, in the closed interval [0,3], that satisfy the conditions of the Mean Value Theorem?

Find the volume of the solid generated by revolving the region bounded by the graphs of the equations about the x-axis. y = sin x, y = 0, x = 0 I just need help setting up the formula. So far I got V= the integral from 0 to pi of [(sin²x) - 0²]dx. Is that...

How do you integrate sin²x?

What is the area of the region located between the graphs of y = -x² + x + 4 and y = 2? Thank you so much!

What is the area bounded by the graphs of y = 4x - x² and y = x? Thank you!!

Set up and evaluate the definite integral for the area of the surface generated by revolving the curve about the x-axis. y = (x³/6) + (1/2x), 1≤ x ≤ 2

Set up and evaluate the definite integral for the area of the surface generated by revolving the curve about the y-axis. y = cube rt. (x) + 2 Thank you so much!!

On one of my tests they are asking me if Symboin pandora has a symbotic reletionshio with the Norway Lobster. In my lesson the answer is yes but with the NORWEIGAN lobster. Is this a typo or are the two lobsters the same lobster but with different names?...

The base of a solid is a circle of radius a, and its vertical cross sections are equilateral triangles. The volume of the solid is 10 cubic meters. Find the radius of the circle.

What is the antiderivative of dy/dx = x/(x^2 + 1)?

Find the indefinite integral. Integral of (x+1)/(√(x²+2x-4))dx Thank you for your help!

Find the indefinite integral. Integral of (2x)/(x-4)dx Thank you so much!

Find the indefinite integral. Integral of [1/(4+3x²)]dx Thank you so much for your help!

I have to find the integral of 1/(sq. rt. of (4x-x²)) dx. I know I have to complete the square of the denominator, but im confused on how that process works when im only given 4x-x². Could you demonstrate how to complete the square for that equation? Than...

What is the percentage of potassium chloride to oxygen?

Christopher Columbus' treatment of Native Americans can BEST be described as friendly, peaceful but not friendly, violent& hostile,or fair?

What is the limit as x approaches infinity of 4xsin(1/x)? Can you also show me how you get the answer? Thank you so much!!

Use differentials to approximate the change in the volume of a cube when the side is decreased from 8 to 7.99 cm. (in cm^3) Thank you so much!!

Find the integral from 1 to 0 of arcsin(x)dx Thank you!

If a particle moves in the xy-plane so that at time t>0 its position vector is (e^(t²), e^(-t³)), then its velocity vector at time t=3 is...? Thanks so much!

What is the volume of the solid generated by rotating about the y-axis the region enclosed by y=sinx and the x-axis, from x=0 to x=π? Thank you for your help!!

If f(x)= (3x)^(3x), then f'(x) = ? Thank you!

A particle moves along a path described by x=cos³t and y=sin³t. The distance that the particle travels along the path from t=0 to t=π/2 is... Thank you!

The rate that an object cools is directly proportional to the difference between its temperature ( in Kelvins) at that time and the surrounding temperature (in Kelvins). If an object is initially at 35K, and the surrounding temperature remains constant at...

How do you know what shape the graph in the xy-plane represented by x=3sin(t) and y=2cos(t) is?

A company with a large fleet of cars found that the emissions systems of 18 out of the 65 randomly selected cars they tested failed to meet pollution control guidelines. Is this strong evidence that more than 20% of the fleet might be out of compliance? T...

the wealth that enabled the Italian city-states to lead in the development of Renaissance arts was derived mainly from? a)the quantities of gold and silver brought back to Italian explorers b)concentration of riches in the hands of the king and his court...

Simplify: (3c^2)(-6cd)^-2

Simplify: a^4-b^4/a-b

The Greek base HELI- means?

A mixture of gases at 760.0 torr contains 35.0% nitrogen, 22.0% oxygen , and 43.0% carbon dioxide by volume. What is the pressure of the carbon dioxide gas in torr?

A satellite orbiting at an elevation of 3200 km does what a) Stays beyond the earth's gravity, which is why it stays up there. B) in an elliptical orbit, since its speed is less than the escape velocity. C) Falling toward earth with an acceleration equal...

When the following are placed in water, for which of them will the buoyant force be more than as its weight? A) an ice cube B) a piece of frozen glycerin C) a gold ring D) a piece of aluminum foil 2. Sometimes when I get in my swimming pool I take a plast...

I have to write a 700 word essay on what my name means ????????????? And I need help!!!!

I need to write a 700 word essay on what my name means. Can I please get some help!!!

Hi I have a speech to present and my professor gave me the outline on how to prepare it but I'm having a hard time setting it up. Is their any kind of way you can help me. Thank you, Erica

if a car can accelerate at 6m/s2, how fast can it accelerate if it is towin an identical car behind it?

Epsom salts consist of magnesium sulfate heptahydrate. Write its formula. a) How many atoms of oxygen are in 5.15g of Epsom salts? b) How many formula units of the compound are present in 5.15g? c) How many moles of water molecules are in 5.15 g of Epsom...

Calculate the amount (in moles) of Cu²+ ions in 3.00g of CuBr₂. Thank you so much for the help!!

Answers

The following answers were posted by visitors named Erica.

if boron has 5 protons in its nucleus how many neutrons are there?and how many electrons? what if b-7 was an isotope how many nentrons are present in this atom? thanks for your help

the answer is 70 because it is a multiple of both 2 and 7, it is less than 100 but larger then 50, and it is the product of 3 primes 2,5, and 7

I am having problems with this part: add the equations... 33+63)km/time=64km/hr then time= 96/64 hr (I know this is 1.5) Now solve for speed of wind in the first equation.. (is it 33km/1.5 =22) 33km/time=32km/hr-speedwind.

YesYes. The question original is: Indicate the case, person, number and gender of the bracketed words. I only have trouble with indicating the gender. Thanks!

My other friend with the same assignment put dual for all of them.

I haven't watch that movie before, do you mind telling me exactly which part relates to memory and learning? I tried to find it in youtube, but not sure which part. thanks!

there is a picture on google images... if you type in "crystal structure of lithium sulfide"......

So you need to make two equations, and then use substitution. I used A for the larger number and B for the smaller: A=B+5 4A+3B=97 Then you plug in (B+5) for A in the second equation... 4(B+5)+3B=97 4B+20+3B=97 7B+20=97 7B=77 B=11 A=5+11 A=16

I'm sorry, but that doesn't make sense to me, is there any other way you can explain it? Thanks.

I believe that it is A

The question is asking you what you'all did there?

Are the pH's at 5mL, 15mL, and 25mL equal the respective pKa's (11.60, 6.77, and 2.25) since they are all half-equivalence points?

How do I solve 2x-4=x-10?

That helped a lot. Thank you so much.

Can you please explain it a little more. I still don't understand it.

Ok thanks. Can 1/2K also be written as K/2?

Start by taking out all the details. They are good, but this is a summary not a report about the book. You can still summarize those points but not in depth. Hope I helped! :)

YESS!!! you are a life saver! ;-)

Your question is not a question. What are you asking help for? 52 and what number?

Okay is it 1 or i?

What don't you understand the inches or the millimeters?

What grade is he in?

go to google and type in ixl then click on the website. click on first grade. try this site, and let me know if this helps. :-)

what is your guess?

Try to first multiply it. You should get your answer correct that way. :-)

Look at a multiplication table.

It needs to be with my first name which is "Erica". Sorry I am new to this website and I did not see your question.

Scrapbooking can be fun and release stress and it can be a good memory for yourself and for your loved ones especially if you have kids. You can also make birthday cards and invitations. More than anything scrapbooking can help you be creative. Does that...

My speech can be about anything so I'm going to write and talk about scrapbooking because that is something I enjoy doing.

Oh okay I see now. It's just seemed kind of confusing because I have never had a speech class before.

Amyris Biotechnologies was building a plant in 2009 and had synthetic technology to change sugarcane to fuels and chemicals that can be renewed. Their marketing firm was looking for a chemical and a fuel that could be recycled for future use. In 2011, it...

would you multiple 500x0.20 and then divide the amount with 1.30

That website is very helpful! Thank you :) So, because there is no "to" would the infinitive phrase include the verb too? : "made him work hard"

So the answer is 4.88?

F=kx F (tension of the strand)=1.2 pN x (displacement)=26 µm Solve for k, which is the spring constant. You may need to convert your unit measurements, as your answer's unit will come out in pN/µm instead of the standard N/m. (I know this is a little late...

all these numbers kind of confuse me. Im not sure what ^ means. Right now the only equation i have learned is y= a(x-s)(x-t)

thank you so very much

thank you so much for the explanation

Pat worked 43 hours and received $7.25 per hour for regular pay and time-and-a-half for all hours over 40 hours. What were her weekly earnings? $22.83 $322.63 $269.75

If y(t) depends on what C is, then how this equation doesn't contradict the uniqueness theorem if it has many solutions?

I read the info, but it doesnt talk about functions with no equilibrium point.

θ = 30° x-direction: vi + vf cos θ = x 1.4m/s - 0.79m/s(√3/2) = 0.716m/s y-direction: vf sin θ = y 0.79m/s * 0.5 = 0.395m/s Speed = √(x² + y²) √[(0.716)² + (0.395²)] = 0.818 m/s Direction: Tan-¹ (y/x) = Tan-¹ (.395/.716) = 28.88° -> 28.9°

same here.I'm panicking because I don't understand anything in that class. Never again will I take physics online.

To plot the potential energy, simply plug your givens into the equation U=(1/2)kx^2. You should get a parabola that goes to 0 in the center. To determine the turning points of the block, use the law of conservation of energy. You know that Ui+Ki = Uf+Kf s...

To plot the potential energy, simply plug your givens into the equation U=(1/2)kx^2. You should get a parabola that goes to 0 in the center. To determine the turning points of the block, use the law of conservation of energy. You know that Ui+Ki = Uf+Kf s...

Elena, why do you have a 13 & 23 beside F? Or is this just to distinguish between the two forces

Could you elaborate on this?

This looked a little sloppy imo... Here's my example 1. Find most probably velocity of Krypton v = √[(2*8.314J/K*273K)/(0.083798 kg)] = 237.75 m/s Find the ratio of each velocity 205/237.75 = .8808 The average is .8851 207/237.75 = .8894 Find the ratio of...

Thank you very much Ms. Sue!!

Thank you Ms. Sue!!!

Okay sorry studying for finals. I am going to try and do this one by myself. Thank you :)

3x-2(3x-2) -3x+6x-4 -3x+4 Ms. Sue this is what I did. Do you think is correct?

Finally!! Thank you!!

a small farm field is a square measuring 340 ft on a side. what is the perimeter of the field?

Revised answer: 815*.025*8/12= $13.79 $8.00*4= $32.00 32.00 - 13.79= $18.42 net cost

I just took this exam and the answer is, in fact, cotton yarn.

Idk just wanted to post

to find height: volume = 1/3 * [Base Area] * height so... v = 1/3 * [L * w] * height 88 = 1/3 * [8 *4.6] * height 88 = 12.266667 * height 88/12.266667 = height 7.1739 m = height

using the kinematic equation: Vf = Vo + at Vf = final velocity = 0m/s because she comes to a stop Vo = initial velocity = 5m/s as she is jogging a = acceleration (or in this case deceleration) t = time elapsed = 2 s so... Vf = Vo + at 0m/s = 5m/s + a * 2s...

Static Friction Coefficient = Cfs For of Static Friction = Fs Normal Force = Fn Centripetal Force = Fc mass = m radius = r speed = v period of time = T Fs = Cfs * Fn so Cfs = Fs/Fn Fc = Fs and since Fs = mv^2/r Cfs = Fs/Fn = mv^2/r*Fn v = 2πr/T and Fn = m...

well that doesn't look readable. the answer should still be right but I'll rewrite how I did the math Cfs = mv^2/rFn = ((2πr/T)^2)/r(g) = (4(π^2)r)/g(T^2) Cfs = 4(π^2)(0.159 m) / (9.8 m/s^2)(1.50 s)^2 = 0.28467

I'm guessing D, but not sure.

It is very confusing.

I would have to type it from the text book. It's 2 pages long.

How much are you willing to spend?

How about a nice body wash set?

After reading it again, I think it may be C now.

OK. So the answer is D - none of the above.

Milton Friedman observes that if the same argument that advocates of corporate social responsibility say should be brought to corporate shareholders is instead brought before union members, the logical bankruptcy of the argument would be clearly evident b...

How does Milton Friedman present the common understanding of socially responsible acts on the part of business? All of the above

The answer that I got was 13x10=130 and 15x7=105

My answer is saying it is -1400/x^2 -0.01 but I got C'(x) = 6 - 0.02x. Why is this?

Was the answer to this question ever determined?

My test was different but yes B is correct. Here is all the multiple choice on mine! I hope this helps. 1. D 1:727 2. D The polygons are not similar 3. A Triangle JMK~Triangle MLK~ Triangle JLM 4. A a=400/21, b=580/21 5. B X=10.5

I don't know that's why im asking you

BrO^3- + 3Sb^3+ + 6H^+ -----> Br^- + 3Sb^5+ +3H2o

You have to set up a proportion. The 20 goes diagonal to the 25. 1 goes in the denominator of the 20. The answer goes in the numerator of the 25.

Thanks, Scott! I got the height as 16 and distance as 12m.

Forgot to put the options, didn't know how to go about getting answer, didn't want to just guess. A. y={x^2}/{15} B. y= {x^2}/{15}-{x}/{6} C. y=-{x}/{6} D. y=x^2-{x}/{6}+{1}/{x}

Estimate 5,602_2,344

a 14 year bond for kathy corporation has a market price of $1025 and a par value of $1000. If the bond has an annual interest rate of 6 percent, but pays interest semiannually, what is the bond's yield to maturity?

20 five pound bags of apples 4 apples is equivalent to 1 pound. There are 400 apples. Divide 400 by 20 and you get 20. 400/20=20

I have like 7 questions on this poem and I REALLY need the exact answers to them. XD

45 fingers how many fingers went up?

hi xavier, did you used to go to laurens middle school by any chance

No, actually part B is 0.15 times 80 which equals 12.

Never mind. I get it now

Whats your problem ms.sue? And how do you know its from the same adress? To me that sounds lie your being nosie

1,260 but not sure