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Questions Asked on February 23, 2013

Can someone check my answers please and if Im wrong please explain.1) graph 4x^2+4y^2=64. what are the domain and range?
1. 57 answers
2. asked by lee
3. 19,356 views
A few more question Id like for someone to check please.1) what are the vertex, focus, and directrix of the parabola with the
1. 2 answers
2. asked by lee
3. 8,530 views
Phosphoric acid is a triprotic acid with the following pKa values:pka1: 2.148 pka2: 7.198 pka3: 12.375 You wish to prepare 1.000
1. 5 answers
2. asked by Sam
3. 5,409 views
A forest ranger in a 140-foot observation tower sees a fire moving in a direct path toward the windmill by the lake. The angle
1. 6 answers
2. asked by Snake
3. 4,168 views
a sample of an unknown metal has a mass of 21.6g and a volume of 8.00cm^3 . calculate the density of the unknown metal
1. 6 answers
2. asked by Stefan
3. 2,989 views
what are the two critical points for r=4cos( 4(theta)) and its symmetries. As well as for r=2+2sin(theta)?
1. 1 answer
2. asked by cindy
3. 2,798 views
find the area of the shaded region in the figure assuming the quadrilateral inside the circle is a square.x^2+y^2=36 (the
1. 3 answers
2. asked by matt
3. 2,735 views
The acceleration of gravity on the surface of Venus is 8.9m/s^2. Would a ball thrown upward on Venus return to the ground sooner
1. 1 answer
2. asked by jake
3. 2,537 views
Determine two angles between 0°and 360°that have a secant of -4. Round your answers to the nearest degree.There are tw answer
1. 1 answer
2. asked by Priya
3. 2,523 views
Mike and Lani stand 21.2 meters apart. From Mike’s position, the angle of elevation to the top of the Eiffel Tower is 40°.
1. 2 answers
2. asked by Charlie
3. 2,251 views
This question has been bugging me for a long time. A rock contains a Pb-206 to U-238 mass ratio of .145 to 1.00. Assuming that
1. 1 answer
2. asked by Nancy
3. 2,112 views
2.8% hydrogen, 9.8% nitrogen,20.5% nickel, 44.5% oxygen, and 22.4% sulfurdetermine empirical formula for compounds
1. 3 answers
2. asked by tula
3. 2,019 views
A spring stretches 0.150 m when a 0.30 kg mass is hung from it. The spring is then stretched an additional 0.100 m from this
1. 1 answer
2. asked by Lori
3. 1,904 views
A lens with a focal length of 25 cm is placed 45 cm in front of a lens with a focal length of 5.0 cm.a) How far from the second
1. 1 answer
2. asked by Cassie
3. 1,783 views
Ammonia is composed of hydrogen and nitrogen in a ratio of 9.33 g of nitrogen to 2.00 g of hydrogen. If 2.19 g of nitrogen
1. 1 answer
2. asked by alex
3. 1,719 views
Write the complex number z = 2 + 5i in polar form, rounding to the nearest hundredth if needed.
1. 1 answer
2. asked by Jane
3. 1,616 views
Why are the atomic masses listed in the periodic table not whole numbers?Answer Scientists have yet to make the precise
1. 2 answers
2. asked by jj
3. 1,616 views
A cylinder contains one liter of air at room temperature (300 K) and atmospheric pressure (10^5 N/m^2). At one end of the
1. 0 answers
2. asked by Jane
3. 1,439 views
A bag contains two blue, three purple, four yellow, two red, three green and one orange marbles.What is the conditional
1. 1 answer
2. asked by Becky
3. 1,349 views
True or False. When non-conservative forces are present, the amount of work done increases with the length of the path.
1. 2 answers
2. asked by Anonymous
3. 1,338 views
A test car travels in a straight line along the axis. The graph in the figure shows the car's position as a function of time
1. 0 answers
2. asked by Dani
3. 1,312 views
When 4.54 g of a nonelectrolyte solute is dissolved in 565 mL of water at 29 °C, the resulting solution exerts an osmotic
1. 1 answer
2. asked by Jim
3. 1,226 views
I have a problem like this:CHCl3 + Cl2 = CCl4 +HCL This is the rate table: CHCL3 Cl2 Initial Rate .010 .010 .0035 .020 .010
1. 2 answers
2. asked by Nancy
3. 1,223 views
(sec^2x-1)(csc^2x-1)=1 prove the following identityive been stuck on this for hours please help
1. 2 answers
2. asked by Anonymous
3. 1,220 views
The broadest type of search, which looks for your terms any where , is a/an .A. title B. keyword C. auther D. subject my answer
1. 1 answer
2. asked by Kim
3. 1,210 views
pHC ( dark green) pH : 8 d ( purple) pH : 3 Suppose u mix togather equal amounts of the solutions that produced the results of
1. 1 answer
2. asked by Mia
3. 1,203 views
Write the following complex number in polar form: z = 4 − 4i
1. 1 answer
2. asked by Alice
3. 1,181 views
A $90,000 investment is made. Over a 5 year period, a return of $30,000 occurs at the end of the first year.Each successive year
1. 0 answers
2. asked by katie
3. 1,133 views
If the sales tax on an item is 7%, the sales tax on an item costing d dollars can be found by the expression .07d. Determine the
1. 1 answer
2. asked by TASHA
3. 1,111 views
One reaction that produces hydrogen gas canbe represented by the unbalanced chemical equation Mg(s) + HCl(aq) −! MgCl2(aq) +
1. 1 answer
2. asked by Anonymous
3. 1,103 views
A femur is a bone in the leg whose minimum cross sectional area is about 4.0 x 10^-4 m^2. A compressional force in excess of 6.8
1. 1 answer
2. asked by Lori
3. 1,058 views
A cylindrically shaped piece of collagen is being stretched by a force that increases from 0 to 3.0 x 10^-2 N. The length and
1. 0 answers
2. asked by Lori
3. 1,053 views
ABCD is a parallelogram.AB=9cm,BC=5cm and DE is perpendicular to AB.If the area of parallelogram is 36sqcm,find AE?
1. 1 answer
2. asked by Anonymous
3. 1,040 views
use implicit differentiation to find dy/dx . Then evaluate the derivative function at the designated point.x2y2 − 1= 0;(0.5,
1. 0 answers
2. asked by jimbob
3. 1,031 views
Suppose <A is one of the acute angles formed by the line x+2y=6 and the x axis. What is the approximate measure of <A to the
1. 2 answers
2. asked by Snake
3. 1,029 views
The antenna broadcasts radio signals at the resonant frequency of the tank circuit. Suppose that a certain tank circuit in a
1. 1 answer
2. asked by Please HELP
3. 998 views
Please explain,A clown in a circus is about to be shot out of a cannon with a muzzle velocity of 15.2 m/s, aimed at 52.7° above
1. 0 answers
2. asked by Kathy
3. 988 views
Convert the complex number c=3cis 0.25 into rectangular form.
1. 1 answer
2. asked by Jane
3. 978 views
ABCD is a square of side length 1. E , F , G and H are the midpoints of AB , BC , CD and DA , respectively. The lines FA , AG ,
1. 1 answer
2. asked by Anonymous
3. 975 views
Consider the meaning of bloodletting and human sacrifice to the Mesoamericans How do these practices make sense in the context
1. 1 answer
2. asked by Gregory
3. 970 views
How would you classify the following material?swimming pool waterhomogeneous mixture<<< heterogeneous mixture a pure element a
1. 1 answer
2. asked by JJ
3. 968 views
A standard biological microscope is required to have amagnification of 200.1)When paired with a 10 eyepiece, what power
1. 3 answers
2. asked by Cassie
3. 957 views
L=2x-1W=x+3 Area =294cm find length and with of rectangle
1. 1 answer
2. asked by Kay
3. 941 views
In a series RCL circuit the generator is set to a frequency that is not the resonant frequency. This nonresonant frequency is
1. 0 answers
2. asked by Please HELP
3. 915 views
A cylindrical container is 30cm in diameter. If is filled at rest by 20 cm of fresh water, and then spun at 30 rpm. after state
1. 0 answers
2. asked by Ahmed Mohammed Ali
3. 892 views
A force of 20 N gives an object an acceleration of 5m/s^2. (a) What force would be needed to give the same object an
1. 0 answers
2. asked by jake
3. 808 views
Suppose u place a beaker containing a solution in a refrigerator , an hr later a white solid is found on thr bottom of thr
1. 1 answer
2. asked by Mia
3. 775 views
If fixed cost is $8,000, variable cost is $5,000 at an output of 2 and $9,000 at an output of 3, how much is marginal cost at an
1. 3 answers
2. asked by Lisa
3. 774 views
The number of gallons of water remaining in a swimming pool t minutes after the drains are opened and the pool begins emptying
1. 0 answers
2. asked by Chase
3. 767 views
27. Pretend you are a carbon atom that was part of a molecule of CO2 dissolved in the water at the beginning of the experiment.
1. 2 answers
2. asked by roger
3. 758 views
What units of measurement do you use to measure the earth to...1. Moon 2. Galaxy 3. Sun 4. Communication satellite 5. Pluto 6.
1. 2 answers
2. asked by Abbey
3. 757 views
An electron accelerates from rest to the right, in a horizontally directed electric field. The electron then leaves the electric
1. 0 answers
2. asked by Ginny
3. 748 views
0.50g of a mixture of K2c03 and Li2c03 requires 30ml of a 0.25N hcl solution for neutralization. What is the percentage
1. 1 answer
2. asked by Fai
3. 739 views
An isosceles trapezoid has bases of length 20 and 12 centimeters and legs of length 11 centimeters what is the area of the
1. 1 answer
2. asked by Julieta
3. 723 views
At the start of the reaction there are 0.714 mole of H2, 0.984 mole of I2, and 0.886 mole of HI in a 2.70 L reaction chamber.
1. 2 answers
2. asked by Amy
3. 719 views
The number of gallons of water remaining in a swimming pool t minutes after the drains are opened and the pool begins emptying
1. 0 answers
2. asked by Chase
3. 695 views
The resistances of a platinum resistance thermometer at the ice point, the steam point and the boiling point of sulphur are
1. 0 answers
2. asked by shashi ranjan
3. 695 views
which of the following ideas was not promoted by the social contract theory
1. 0 answers
2. asked by keona
3. 692 views
abcd is a parallelogram with sides ab=12 cm,bc=10 cm and diagonal ac=16 cm .find the area of the parallelogram also find the
1. 1 answer
2. asked by Shubham
3. 690 views
I have an essay due and I cannot really understand the topic im supposed to write about. Its about the novel "sense and
1. 6 answers
2. asked by kaliegh
3. 686 views
Proteins found on the outside of cells and viruses are called ____________ , these are used by the body to _______________
1. 3 answers
2. asked by Brooke J.
3. 680 views
1.What is the organization in the first paragraph of "The Next Big Thing"? (1 point) chronological order compare and contrast
1. 4 answers
2. asked by Anonymous
3. 679 views
1/a-y=1/ysolve for "y"
1. 4 answers
2. asked by NEED HELP NOW!!
3. 678 views
3 equal charges (all +Q) are located at A, B and C. ABC is an equilateral triangle with sides d. Point A is located at (0,0),
1. 0 answers
2. asked by P
3. 656 views
Details:Part I: Principles of the Constitution Create a chart or a matrix outlining the following primary principles of the
1. 1 answer
2. asked by Sylvia
3. 656 views
An animal-rescue plane flying due east at 33.0 m/s drops a bale of hay from an altitude of 58.0 m. If the bale of hay weighs 173
1. 1 answer
2. asked by Anonymous
3. 651 views
Which organism evolved before the others in geologic time?mammals amphibians reptiles **fish Which type of organism evolved
1. 1 answer
2. asked by Bob
3. 648 views
The total pressure in a vessel containing hydrogen collected over water at 25.0°C was 0.8 atm. The vapor pressure of water at
1. 1 answer
2. asked by Lupe
3. 637 views
At noon, you and I start at the same place, and then you head east at a speed of 5 kilometers per hour, and I head north at a
1. 0 answers
2. asked by lisa
3. 634 views
I am not a english speaker!!!!!!!!i am writing a resume is this statement correct: I am introducing my work: Student focus
1. 1 answer
2. asked by rita
3. 631 views
calculate the pH and the propionate ion concentration [c3h502-] of a solution that is .06M in potassium propionate [kc3h502] and
1. 2 answers
2. asked by Michael
3. 622 views
During a circus performance, a 77-kg human cannonball is shot out of an 20-m-long cannon. If the human cannonball spends 0.91 s
1. 1 answer
2. asked by Ronnica
3. 621 views
You plan to open a retirement account. Your employer will match 50 percent of your deposits up to a limit on the match of $2500
1. 1 answer
2. asked by katie
3. 619 views
FIND THE VALUE OF K, SO THAT THE EXPRESSION IS A PERFECT SQUARE TRINOMIAL.x^2+6x+k k=
1. 1 answer
2. asked by student needs immediate help
3. 619 views
use implicit differentiation to find dy/dx . Then evaluate the derivative function at the designated point.log (xy)= 2; (4, 25)
1. 1 answer
2. asked by mark11
3. 613 views
For a population of μ = 70 and σ = 20, find the z-score and percentile rank for each of the following X scores: 80, 100, 65,
1. 1 answer
2. asked by jackee
3. 611 views
What were Alexander's lasting contributions to society?
1. 1 answer
2. asked by Gregory
3. 607 views
Need help with this practice problem. I got the values for the gas to liquid and liquid to solid. Don't know how to do the rest?
1. 1 answer
2. asked by Chemkid
3. 606 views
Biphenyl, C12H10, is a nonvolatile, nonionizing solute that is soluble in benzene, C6H6. At 25 °C, the vapor pressure of pure
1. 1 answer
2. asked by Anonymous
3. 595 views
Mg(s) + 2HCl(aq) −> MgCl2(aq) + H2(g)What mass of MgCl2 is produced? Answer in units of g second part What mass of H2 is
1. 1 answer
2. asked by Anonymous
3. 594 views
abcd is a parallelogram with sides ab=12 cm,bc=10 cm and diagonal ac=16 cm .find the area of the parallelogram also find the
1. 2 answers
2. asked by Anonymous
3. 589 views
From 5 statisticians and 6 economists, a committee consisting of 3 statisticians and 2 economists is to be formed. How many
1. 0 answers
2. asked by Therese
3. 585 views
What results in the combination of the haploid sets of chromosomes from two individuals into a diploid zygote
1. 2 answers
2. asked by Candy
3. 577 views
pHStrip b = 10. Strip D = 3 what would happen if you mixed togather equal amounts of the solutions that produced the results of
1. 1 answer
2. asked by Mia
3. 575 views
3 equal charges (all +Q) are located at A, B and C. ABC is an equilateral triangle with sides d. Point A is located at (0,0),
1. 0 answers
2. asked by P
3. 572 views
Create an outline that includes details that support your thesis. Outline only the body of your paper. Remember to avoid bias to
1. 1 answer
2. asked by rosita
3. 565 views
An isosceles trapezoid has bases of length 20 and 12 centimeters and legs of length 11 centimeters what is the area of the
1. 0 answers
2. asked by Julieta
3. 564 views
Write the complex number z = −6 in polar form
1. 1 answer
2. asked by Jane
3. 559 views
Given two numbers whose sum is 56. Six times the larger is 72 more than 5 times the smaller. Find the numbers. Please help me
1. 2 answers
2. asked by Traci
3. 552 views
You decide to open an IRS-approved retirement account at your local brokerage firm. Your best estimate is that it will earn 9
1. 0 answers
2. asked by manny
3. 551 views
kylie answered my question but did not go into detail how to solve the problem. Here's the problem I need help with. Given two
1. 1 answer
2. asked by Traci
3. 550 views
electricity costs 7.57 a month plus 8.77 per kilo watt hour for the first 400 kWhr and 6.574 per kWhr for all useage over 400 in
1. 0 answers
2. asked by Lori
3. 547 views
F(x)= log_3 (1-5x)F'(x)=
1. 1 answer
2. asked by Britt
3. 545 views
How much money would have to be deposited into a compound interest savings account earning 5% each year in order to accumulate
1. 0 answers
2. asked by Don
3. 542 views
Need help with this practice problem. I got the values for the gas to liquid and liquid to solid. Don't know how to do the rest?
1. 0 answers
2. asked by Chemkid
3. 538 views
A person buys a refrigerator for rupees 12000. He pays rupees 6000 in cash and agrees to pay the balance in 12 annual
1. 0 answers
2. asked by Anonymous
3. 531 views
find the radius of the circle if length of arc is 4p cm and angle made by the arc atthe centre is 40 deg.find the area made by
1. 1 answer
2. asked by urvashi
3. 528 views
Determine two angles between 0°and 360°that have a secant of -4. Round your answers to the nearest degree.There are tw answer
1. 0 answers
2. asked by Priya
3. 527 views
I am confused on how solve this substitution problem4y+3=3y+x 2x+4y=18 If you can, show work please (:
1. 2 answers
2. asked by Stephanie
3. 526 views
use implicit differentiation to find dy/dx . Then evaluate the derivative function at the designated point2xy2 – y = 10; (1,
1. 0 answers
2. asked by jimdandy
3. 524 views

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