Erica

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

Questions

The following questions were asked by visitors named Erica.

One of the five charateristics of living things is being able to reproduce. Do all living things have to have all charateristics? Mules are living things and most are sterile. (I have heard of a few cases where a mule has given birth.) What about women wh...

The monthly revenue acheived by selling x boxes of candy is calculated to be x(5-0.05x)dollars. The wholesale cost of each box of candy is $1.50. How many boxes must be sold each month to achieve a profit of at least $60. Can someone please let me know ho...

The surface ares S (in square meters) of a hot air ballon is given by s(r)=4 pi r^2 where r is radius of balloon (in meters). If the radius r is increasing with time (in seconds) according to the formula r(t) = 2/3t^3, t is greater than or equal to 0, fin...

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 function f(x)= x^4 is not one-to-one. Find a suitable restriction on the domain of f so that the new function that results is one-to-one. Then find the inverse of f. Restrict it to be non-negative to meet the 1-1 requirement.

The period T (in seconds) of a simple pendulum is a function of its length l (in feet), given by T(l) = 2pi sq root of l/g, where g = 32.2 feet per second per seconds is the acceleration of gravity. Express the length l as a function of the period T. If T...

The pH of a chemical solution is given by the formula pH = -log10 [H+] where [H+] is the concentration of hydrogen ions in moles per liter. Values of pH range from 0 (acidic) to 14 (alkaline). (a) what is the pH of the solution for which [H+] is 0.1? (b)...

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...

The logistic growth model p(t)=0.90/1+3.5e^-0.339t relates the proportion of new personal computers sold @ Best Buy that have Intel's latest coprecessor t months after it has been introduced. a) what proportion of new personal computers sold @ Best Buy wi...

Solve eacy system of inequalities. If the system has no solution, say that it is inconsistant. x -y -z = 1 2x +3y +z = 2 3x +2y = 0 add the top two equations. 2x+2y =3 That is inconsistent with the last equation.

find real numbers a,b,c so that the graph of the function y=ax^2+bx+c contains the points (-11,4), (2,3) , and (0,1) Write three equations, with each point in one. Then solve the three equations.

solve each system of equations using matrices x+2y-3z=0 2x-4y=z=-7 -2x+2y-3z=4 I don't see how it is possible to even attempt a matrix on this text oriented site.

What international moral code, if any, is being violated by the Bank? What bank? What did "the Bank" do that might have violated international moral code? Please explain and we'll be glad to help you find the answer.

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...

Which provides more cooling for a styrofoam cooler, one with 10 lbs of ice at 0 degrees C or one with 10 lbs of ice water at 0 degrees C. Explain. qice=mass*heat of fusion. qH2O=mass*specific heat x delta T However, you aren't given a two temperatures; th...

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...

Spent steam from an electric generating plant leaves the turbines at 120.0 degrees Celsius and is cooled to 90.0 degrees Celsuius liquid water by water from a cooling tower in a heat exchanger. How much heat is removed by the cooling tower water for each...

Find the general solution of the differential equation specified. 1) dy/dt= 1/(ty+1+y+1) 2) dy/dx=sec y I got y(x)=arcsin(x) for the second one. I'm not sure what to do with the first one.

What are the sectores of the economy? Since this is not my area of expertise, I searched Google under the key words "<I>economy sectors</I>" to get these possible sources: http://www.tutor2u.net/economics/content/topics/development/development_economy_sec...

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...

What is the average ion concentration in a 7.9 mL saturated solution of calcium hydroxide containing calcium chloride (CaCl2)?

Can someone tell name 6 effects of ocean currents? Thanks Since this is not my area of expertise, I searched Google under the key words "<I>'ocean currents' effects</I>" to get these possible sources: http://www.thecanadianencyclopedia.com/index.cfm?PgNm=...

How do I do a Bibliography for an interview? Thank you for using the Jiskha Homework Help Forum. Here are some sites on how to write a Bibliography and the second one is good for an interview: 1. http://dicksonc.act.edu.au/Library/bibliog.html 2. (Broken...

Why is it impossible to have an Arctic Circumpolar Current? http://www.whoi.edu/science/PO/arcticgroup/projects/proshjohnson-two-regimes.pdf

1. How do meteorologists forecast El Nino and La Nina? 2. Effects of El Nino and La Nina with regards to ocean currents and air currents. Meteorologists have not been very successful at forecasting them so far; it is mainly a question of monitoring it to...

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

Directions say that I have to solve and graph the equation using words.I have to include whether the lines are dotted or solid, how to graph each of them and where the solution is shaded. 2x-3y>_9 and -x-4y>_8 both should be solid, because the solution is...

Directions are that i have to solve the equation and graph it using words.I have to include whether itis a solid or dotted line and which way the shading is. Problem: -2x+3y<-6 dotted line. There is no equals in the problem. Which way for shading... solve...

Directions:Write inequalities for the numbers 2 - 4 below. Do not solve them! Problems: 2.Your quiz grades are 19, 17, 20, and 15. What is the lowest grade you can receive on the next quiz and maintain at least an 18 average? 3.Stacey and Luis volunteer a...

x^2+4 x^2+4 = (x + 2 i) (x - 2 i) Wouldn't you need a value for x? Or do u just have to make an expression? An expression for this example would be xx+4 O never mind my answer was incorrect. Sorry about that.

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: (I could not paste the actual picture from the assignment here, but if you go to Google Image and type in "crystal...

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 task component distinguishes the Wechsler Scales from the SBIS?

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...

The total cross-sectional area of the load-bearing calcified portion of the two forearm bones (radius and ulna) is approximately 2.5 cm2. During a car crash, the forearm is slammed against the dashboard. The arm comes to rest from an initial speed of 80 k...

I have to find the function rule that goes with this table... X Y 2 8 4 18 7 33 9 43 12 57 I've been trying to figure it out for an hour and can't find anything that works for all of them.

If a confidence interval for the mean is 24.8 < ì < 29.6. What is the margin of error?

A group of 56 randomly selected students have a mean score of 30.8 and a standard deviation of 4.5 on a placement test. Find a 95% confidence interval for the mean score, ì, of all students taking the test. (Note: ó is unknown.)

Independent samples of n1 = 400 and n2= 400 observations were selected from binomial populations 1 and 2, and x1 = 100 and x2 = 127 successes were observed. What is the best point estimator for the difference ( p1-p2) in the two binomial proportions? a. -...

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

Locate any relative extrema and inflection points. y = (ln x)/x

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 area of the largest rectangle that can be inscribed under the curve y = e^(-x^2) in the first and second quadrants.

Solve the equation for x. arcsin(sq. rt.(2x)) = arccos(sq. rt(x))

Verify each identity. a) arcsin(-x) = -arcsin x; abs. val. (x) is less than or equal to 1. b) arccos(-x) = pi - arccos x; abs. val. (x) is less than or equal to 1.

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

Find the derivative of the function. y = x arccos x - (sq. rt. (1 - x^2))

Verify the differentiation formula. d/dx[arcsin u] = u'/(sq. rt. (1-u^2))

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]?

If t is measured in hours and f '(t) is measured in knots, then integral from 0 to 2 of f '(t)dt = ? (Note: 1 knot = 1 nautical mile/hour)

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?

The volume of the solid formed by revolving the region bounded by the graph of y = (x-3)² and the coordinate axes about the x-axis is given by what integral?

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?

Let f(t) = 1/t for t>0. For what value of t is f ' (t) equal to the average rate of change of f on [a,b]?

Let f and g be differentiable functions such that f(1) = 4, g(1) = 3, f '(3) = -5 f '(1) = -4, g '(1) = -3, g '(3) = 2 If h(x) = f(g(x)), then h '(1) = ?

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