Friday

December 19, 2014

December 19, 2014

Total # Posts: 75,743

**PLEASE HELP CHEMISTRY**

CuSO4.xH2O Determine the percent by mass of water in your sample of hydrated copper (II) sulfate. Show your calculations clearly. My work. i got 10% is that correct
*December 1, 2014*

**help**

this is for a project
*December 1, 2014*

**help**

please someone help im sorry for bothering
*December 1, 2014*

**help**

can we predict when a hurricane will occur
*December 1, 2014*

**pretty algebra**

A commuter train pulling 8 cars had room for another 84 passengers. Halfway...
*December 1, 2014*

**math**

A recipe for a home-made disinfectant calls for adding one-half cup of clorox to one gallon of water. Mrs. Jenkins wants to make this solution in a 32-ounce spray bottle. How many fluid ounces of clorox should be added to 32 fluid ounces of water to have the same clorox-to-...
*December 1, 2014*

**Algebra**

Thankyou
*December 1, 2014*

**ethics**

Which of the following answers to the meaning of life did Tolstoy hold prior to his change of heart and mind?
*December 1, 2014*

**science**

A jellyfish can propel itself with jets of water pushed out of its bell, a flexible structure on top of its body. The elastic bell and the water it contains function as a mass-spring system, greatly increasing efficiency. Normally, the jellyfish emits one jet right after the ...
*December 1, 2014*

**chemistry**

Thomson example could be - dialysis and the diffusion of gases??
*December 1, 2014*

**chemistry**

dalton- example and picture solid foothold as a fundamental chemical object; fundamented the atomic theory so what would be a pic and ex of his and could that be a contribution
*December 1, 2014*

**chemistry**

Democritus- example and picture is it an atom and a picture of a atoms that she wants?? Did he rely on experimental evidence to justify his ideas? yes he gave an image of an atom that distinguished them from each other by their shape, size, and the arrangement of their parts
*December 1, 2014*

**physics**

2. You push a 2.0 Kg block against a horizontal spring (the spring constant is k=200 N/m) compressing it by 15 cm. Then you release the block and the spring sends it sliding across a tabletop. The block stops 75 cm from where you released it. (a) Find the work done by the ...
*December 1, 2014*

**algebra 2**

x^2-18x-40=0
*December 1, 2014*

**algebra 2**

Solve for x. 250= (13+x)^2
*December 1, 2014*

**French**

How do I say I'm in high school in French? Je suis en lycée?
*December 1, 2014*

**Chemistry**

a gas phase compound has a density of 2.10 g/l at 751 torr and 100 c what is the molecular weight
*December 1, 2014*

**physics**

A rock is thrown downward into a well that is 8.58 m deep. If the splash is heard 1.08 seconds later, what was the initial speed of the rock?
*December 1, 2014*

**Math**

csc ( x ) = 1 / sin ( x ) sin ( x ) = 1 / 7 csc ( x ) = 1 / ( 1 / 7 ) = 7 cot ( x ) = 1 / tan ( x ) tan ( x ) = 2 / 3 cot ( x ) = 1 / ( 2 / 3 ) = 3 / 2
*December 1, 2014*

**Calculus**

Which of the following functions does not have a derivative of zero? A. y=-1/100 B. y=4(pi)^2-9 C. y=sin^2x+cos^2x D. y=cscxtanxcosx E. All do
*December 1, 2014*

**AP Biology**

The respiration of plants is a biochemical reaction and should have a rate determined by the Arrhenius equation, k = Ae-EA/RT. Here, k is the rate, A is a constant, EA is the activation energy for the reaction, R is the gas constant, and T is the temperature in kelvins. If the...
*December 1, 2014*

**science**

An electron of mass 9.11 × 10-31 kg and charge 1.6 × 10-19 C passes through a cathode ray tube with a velocity of 3.7 × 107 m/s. It enters a magnetic field of flux density 0.47 mT at a right angle. What is the radius of curvature of the path in the magnetic ...
*December 1, 2014*

**famu**

Construct a 99% confidence interval for the population mean, ì. Assume the population has a normal distribution. A group of 19 randomly selected employees has a mean age of 22.4 years with a standard deviation of 3.8 years. Round to the nearest tenth.
*December 1, 2014*

**band essay-Ms. Sue**

Thanks for the suggetions and feedback!
*December 1, 2014*

**band essay-Ms. Sue**

Who wouldn’t want the chance to go to Puerto Rico? I have been excited for this band trip opportunity since it was introduced last winter. A once in a lifetime opportunity to share my love of music and explore another culture is an eyeopening experience! I believe I am a ...
*December 1, 2014*

**chemical equations**

The roman numeral confuses me and I don't know what some of the formulas are-once I have the equaiton I can balance it. So I guess my problem is getting to the equation
*December 1, 2014*

**chemical equations**

I need help figuring out how to write these chemical reactions into chemical equations Copper(II)oxide + hydrochloric acid -> copper(II)chloride + water CuO2+ HCl -> CuCl + H2O? Aluminum + copper(II) chloride-> copper + aluminum chloride Al+CuCl -> Cu + AlCl ...
*December 1, 2014*

**chemical equations**

How do I write the chemical equation for Copper(II)nitrate + sodium hydroxide -> Copper(II)hydroxide + sodium nitrate? CuNO3 + NaOH-> CuOH + Na(NO3) is that right? Copper(II)hydroxide -> Copper(II)oxide + water CuOH -> CuO + H2O?
*November 30, 2014*

**trig**

Two circles of radii 5 and 3 cm, respectively, intersect at two points. At either point of intersection, the tangent lines to the circles form a 60◦ angle, as in Figure 2.2.4 above. Find the distance between the centers of the circles
*November 30, 2014*

**Calculus**

Find the limit as x approaches 1 5/(x-1)^2 I don't understand how to solve it because there would be a 0 on the denominator.
*November 30, 2014*

**Chemistry**

This was actually helpful, thank you!
*November 30, 2014*

**Chemistry**

5.) Which of the following is the strongest oxidizing agent? a.) Zn(s) b.) Mg(s) c.) Al3+(aq) d.) Mg2+(aq)
*November 30, 2014*

**chemistry-chemical equations**

thank you :)
*November 30, 2014*

**chemistry-chemical equations**

How do I write the balanced chemical equation for Copper +nitric acid -> copper(II)nitrate+ nitrogen dioxide + water
*November 30, 2014*

**band essay? can you read it?**

This band scholarship would help me immensely to be able to accomplish my goal of going on the trip to Puerto Rico this Spring Break. I am a good candidate for this band scholarship because along the lines of what Mr. Schmitz has said, in order for me to help you, you have to ...
*November 30, 2014*

**band essay?**

thanks, I will proofread and check for errors :)
*November 30, 2014*

**band essay?**

I have to write an essay on why I deserve a scholarship for our band class trip to Puerto Rico, I was wondering what English teachers would be looking at/for in this essay and how long it should roughly be
*November 30, 2014*

**Chemistry**

it is for any chemical reaction, there is not a specific one as long as the video explained what the reactant(s) and the product(s) were then it would work.
*November 30, 2014*

**Chemistry**

I'm looking for a video of a chemical reaction that can help me answer these questions What are the names of the reactants and products and their states @ room temperature? What type of reaction is it?
*November 30, 2014*

**ApWorld history**

Okay thank you so much
*November 30, 2014*

**ApWorld history **

How did religion stay the same throughout the spread of islam in west Africa in circa 800 C.E. and circa 1750
*November 30, 2014*

**Calculus**

Find limit as x approaches 5 (x^2-3x-10)/(x-5)
*November 30, 2014*

**Calculus**

Find limit as x approaches -1 (x^2+2x+3)/(x^2+1) A. 0 B. 1 C. Infinity D. DNE E. None of these
*November 30, 2014*

**ApWorld history**

Thank you
*November 30, 2014*

**ApWorld history **

Would Arabic becoming an important language count as a change to the spread of islam in a ccot essay
*November 30, 2014*

**physics**

How much heat (in kJ) will it take to bring 56 kg of ice at -8°C to dry steam? Answer to 3 significant figures
*November 30, 2014*

**science**

what is pollution
*November 30, 2014*

**math**

Sean has 8-inch pieces of toy train track and Ruth has 18-inches of train track. How many of each piece would each child need to build tracks that are equal in length?
*November 30, 2014*

**Calculus**

Find the derivative: f(x)=1/cubed root(3-x^3) A. -1/3(3-x^3)^4/3 B. x^2/(3-x^3)^4/3 C. -x^2/(3-x^3)^2/3 D. -x^2/(3-x^3)^4/3 E. None of these
*November 30, 2014*

**Calculus**

Find the limit as x approaches 0 [(sqrt(x+9))-3]/x A. 0 B. 1 C. Infinity D. 1/3 E. None of these
*November 30, 2014*

**Calculus**

Find the derivative of x^2f(x) A. x[xf'(x)+2f(x)] B. 2xf'(x) C. x[xf'(x) +2f'(x)] D. x^2f'(x) E. None of these
*November 30, 2014*

**Calculus**

Find an equation of the tangent line to the graph of x^2+3y^2=4 at the point (1,1) A. y+1=-1/3(x+1) B. y-1=-x/3y(x-1) C. x+3y=2 D. y-1=-1/3(x-1) E. None of these
*November 30, 2014*

**Calculus**

Find the equation of the line that passes through (1,3) and is perpendicular to the line 2x+3y+5=0 A. 3x-2y+3=0 B. 2x+3y-11=0 C. 2x+3y-9=0 D. 3x-2y-7=0 E. None of these I got E?
*November 30, 2014*

**math**

Find the height of a ball after 3 seconds, if the ball is hit with an initial velocity of 90 feet per second at an angle of 60 degrees from an initial height of 5 feet.
*November 30, 2014*

**pre-cal**

Find the height of a ball after 3 seconds, if the ball is hit with an initial velocity of 90 feet per second at an angle of 60 degrees from an initial height of 5 feet.
*November 30, 2014*

**English**

How to find a keywords of the quote our deepest fear
*November 30, 2014*

**Calculus**

If f(1)=4 and f'(1)=2, find an equation of the tangent line at x=1 A. y=2x+2 B. y=2x-2 C. y=4x-7 D. y=4x-2 E. None of these
*November 30, 2014*

**Calculus**

Find f'(x) if f(x)=sin^3(4x) A. 4cos^3(4x) B. 3sin^2(4x)cos(4x) C. cos^3(4x) D. 12sin^2(4x)cos(4x) E. None of these I got D using the chain rule?
*November 30, 2014*

**Calculus**

Find d^2y/dx^2 for y=(x+3)/(x-1) A. 0 B. y=-8/(x-1)3 C. y=-4/(x-1)^3 D. y=8/(x-1)^3 E. None of these I got a positive number but am not sure about the denominator in the second derivative.
*November 30, 2014*

**Calculus**

Find dy/dx for y=sin(x+y) A. 0 B. (cos(x+y))/(1-cos(x+y) C. cos(x+y) D. 1 E. None of these I know I'm supposed to use implicit differentiation but I'm not sure how to go about it with sin
*November 30, 2014*

**Calculus**

Find an equation of the tangent line to the graph of f(x)=xsinx when x=0. A. y=0 B. f'(x)=0 C. y=xcosx+sinx D. y=x E. None of these
*November 30, 2014*

**Calculus**

For which of these functions f(x) does limit as x approaches negative infinity f(x)=2 A. (x-2)/(3x-5) B. 2x/sqrt(x-2) C. (2x^2-6x+1)/(1+x^2) D. (2x-1)/(x^2+1) E. None of these
*November 30, 2014*

**Calculus**

Find limit as x approaches 5 (x^2-3x-10)/(x-5) A. 2 B. DNE C. 0 D. 7 E. None of these
*November 30, 2014*

**Calculus**

Sorry, somehow this repeated
*November 30, 2014*

**Calculus**

If f(x) = {x^2+3x-1, x<=2 and -3bx+3, x<2 , find the value of b in order for f to be continuous
*November 30, 2014*

**Calculus**

If f(x) = {x^2+3x-1, x<=2 and -3bx+3, x<2 , find the value of b in order for f to be continuous
*November 30, 2014*

**Calculus**

If f(x)=sin(2x), find f"(x) A. 2cos(2x) B. -4sin(2x) C. -2sin(2x) D. -4sinx E. None of these Is it B from using chain rules?
*November 30, 2014*

**Calculus**

Find the derivative for f(x)=-x^2+x Do I put the -x^2 as a denominator? How would I solve it if that's what I'm supposed to do?
*November 30, 2014*

**Calculus **

Find limit as x approaches -1 (x^2+2x+3)/(x^2+1) A. 0 B. 1 C. Infinity D. DNE E. None of these
*November 30, 2014*

**Calulus**

Find f'(x): f(x)=(x^2-3x)/x^2 A. 2x-3/x^2 B. 2x-3/2x C. 1-(3/x) D. 3/x^2 E. None of these I can put it into the division rule for the derivative but get confused when I'm simplifying.
*November 30, 2014*

**Math**

A game is played by throwing darts at a target. A player can choose to throw two or three darts. Darcy plays two games. In Game 1, he chooses to throw two darts, and wins if he hits the target at least once. In Game 2, he chooses to throw three darts, and wins if he hits the ...
*November 30, 2014*

**Calculus**

Find limit as x approaches 1 5/(x-1)^2 A. 0 B. Negative infinity C. 5/4 D. Infinity If I use limit as h approaches 0 f(x+h)-f(x)/h , will I get an x in the answer?
*November 30, 2014*

**introductory chemistry essentials**

A 3.5 Liter sample of 5.8 M NaCL solution is diluted to 55 Liter. What is the molarity of the new solution?
*November 30, 2014*

**Calculus**

Find dy/dx if x^2+y^2=2xy A. x/(x-y) B. (y+x)/(y-x) C. 1 D. -x/y E. None of these Do I equal it to 0 and use implicit rule?
*November 30, 2014*

**Calculus**

Find f'(x) for f(x)=(2x^2+5)^7 A. 7(4x)^6 B. 7(4x)^7 C. 28x(2x^2+5)^7 D. 7(2x^2+5)^6 E. None of these Would it be none of these because of the 4x in the chain rule?
*November 30, 2014*

**Calculus**

Determine the limit as x approaches 1 f(x) if f(x)={3-x, x does not equal 1 and 1, x=1 A. 2 B. 1 C. 3/2 D. DNE E. None of these
*November 30, 2014*

**chemistry**

What is the maximum amount of silver in grams that can be plated out of 3.8L of an AgNO3 solution containing 3.3% Ag by mass? (Assume that the density of the solution is 1.02g/mL .)
*November 29, 2014*

**Chemistry**

grams would = 15.4866? .053x5 = .265 molar mass of NaCl = 58.44 (Na=22.99 + Cl=35.45) .265x58.44 = 15.4866... I think I did this correctly, if I did not please let me know where I went wrong. Thank you
*November 29, 2014*

**Chemistry**

What does 0.053 M NaCl mean? How many grams of sodium chloride are needed to make 5.0 liters of this solution?
*November 29, 2014*

**Chemistry**

I believe it's hypothetical. Just some simple review for my finals and this one slipped my mind. Thank you so much. 12.5g is needed for 250mL
*November 29, 2014*

**phyics **

If the coefficient of static friction between the board and the wall is 0.81, what is the least force you can apply and still hold the board in place?
*November 29, 2014*

**science**

a rectangle steel block of dimension 10m multiple by 3m multiple by 2m, has mass 45kg calulate the density of the block.
*November 29, 2014*

**math**

FreddieMac reports that the average rate on a 30-year fixed rate mortgage is 3.92% as of January 2012. This is down from 4.76% in January 2011 and 5.03% in January 2010. If you have a $225,000, 5%, 30-year mortgage, how much interest will you save if you refinance your loan at...
*November 29, 2014*

**math**

Multiply 34.5 by 14 and you should get 483 right. So when i did the math, i got 4830. Can you explain what i did wrong? Do i have to cross out the zero?
*November 29, 2014*

**Algebra B**

What is the coefficient of x in the division (18x3 + 12x2 – 3x) ÷ 6x2 ? 3 2 –0.5 –3 I am helping my granddaughter and I need help to explain...
*November 29, 2014*

**English**

What is this?
*November 29, 2014*

**geometry**

which propery of a rigid transformation is exclusive to a ratio?
*November 29, 2014*

**physics**

44 foot skid from a jeep cherokee, how fast was it traveling.
*November 29, 2014*

**Additional maths**

Solve the equation 8x^3 -2x*2 -5x-1=0 Hence find the values of Theta< between 0 and 18 which satisfy the equation 8 tan^2 theta-2 tan theta -5=cot theta
*November 29, 2014*

**maths**

an observer 1.5meters tall is 20.5 metres away from a tower 22 metres high. determine the angle of elevation of the top of the tower from the eye of the observer
*November 29, 2014*

**math**

an observer 1.5meters tall is 20.5 metres away from a tower 22 metres high. determine the angle of elevation of the top of the tower from the eye of the observer
*November 29, 2014*

**Math**

Simplify 25a³b - 10a²b³ + 19b² -10a³b + 30a²b³ - 29b² and factor. I got 5b( 3a^3 - 2b + 4a^2b) But how do I find the GFC?
*November 28, 2014*

**math**

1289530
*November 28, 2014*

**Math**

A cube has a volume of 50 653 cubic metres. What is the surface area of the cube?
*November 28, 2014*

**English**

How do you write reflection and response outline?
*November 28, 2014*

**English**

A for the second choice
*November 28, 2014*

**English**

You___determined to write an A paper for your English class,___ you? a. were, weren't b.was, wasn't c. am ,aren't d. is , isn't I am think A My bus driver __to make up for the time he while__a flat tire. A.hurried,fixed b.hurry,fix c.hurried,fixing d.hurried,...
*November 28, 2014*

**English**

yes c is the rghit answer
*November 28, 2014*

**physics**

A hot air balloon is traveling vertically upward at a constant speed of 2.7 m/s. When it is 11 m above the ground, a package is released from the balloon. After it is released, for how long is the package in the air? The acceleration of gravity is 9.8 m/s 2 . Answer in units ...
*November 27, 2014*

**Math**

The two equal sides of an isosceles triangle are each 24 centimeters. If each of the two equal angles measures 60, find the length of the base and the altitude. (leave your answer in radical form).
*November 27, 2014*

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