# Posts by Sarah

Total # Posts: 5,758

**Algebra**

(2x^-2y^6)^4 / (4x^3y^-4)^2 = I got 16x^14/y^16 The computer is saying it's wrong and I don't get it. Even watched a video on similar problem. Help me!

*September 9, 2016*

**Algebra**

(x^-2)^3 (x^2)^4 on the bottom its x^15 I did this to get my answer (x)^-6 (x)^-8 /x^15 got x^-4 / x^15= x-14-(15)= -29 final answer is x^-29 IDK what I did wrong the computer saying its wrong! Help pleas

*September 9, 2016*

**Math**

The population of a town in 1920 was 3500 people. The town's population decreased linearly, and in 1927 the population was 3185. Find a formula for P, the town's population, in terms of t, the number of years since 1920.

*September 9, 2016*

**Math**

The following equation relates u and t. 3t=(1)/(7+u) Solve for u as an explicit function of t.

*September 9, 2016*

**English**

Is this sentence complete Swimming in the heated water of an indoor pool was a new experience for Elizabeth.

*September 8, 2016*

**English**

I think the answer is "Yes, I think that those big gas guzzlers are a threat to the ecology, don't you?" My friend thinks its without quotations Yes, I think that those big gas guzzlers are a threat to the ecology, don't you?

*September 8, 2016*

**English**

I think the answer is "Jackie, please see whether the postman has oh there he is now." But my friend thinks its this way "Jackie, please see whether the postman has, oh! There he is now."

*September 8, 2016*

**Algebra**

what is the perimeter of the figure if the length is 15/6in and bottom is 15/6 in what would it be. I thought you do 15+ 15+15+15 and divided by 4. you get 60/4 and then final answer would be 15

*September 7, 2016*

**Algebra Word promblems**

Alba Tross had an annual salary of $50,000. She received a 5 percent pay cut one year followed by a 5 percent pay raise the next. a. What is Alba’s final salary? Would it be 50,000 - 5% + 5% =49.875 b. What is Alba’s final salary less than her original salary? Not ...

*September 7, 2016*

**Fractions**

5+ 2/5 would the answer be 5/1+ 2/5 = 5/1 times 5/5 +2/5= 25/5 + 2/5 = 27/5

*September 6, 2016*

**Fractions**

would the answer be 32/3? Not sure

*September 6, 2016*

**Fractions**

4/3 divided by 1/8

*September 6, 2016*

**Algebra**

A family decides that they can spend 3/5 of their monthly income on house payments if their monthly income is $1,500 how much can they spend for house payments?

*September 6, 2016*

**Fractions**

would the answer be 42/40 but then simplify it to 21/20?

*September 6, 2016*

**Fractions**

Find the area of the triangle with base 7/8 and height 6/5

*September 6, 2016*

**Fractions**

3/4 times 4/3

*September 6, 2016*

**Algebra**

A family's monthly income is $1,500, and they spend $300 each month on food. Write the amount they spend on food as a fraction of their monthly income in lowest terms.

*September 6, 2016*

**Fractions**

would be answer be 6/1 times 7/2 = 6 times 7 on top and 1 times 2 on bottom = 42/2 divided both by 2 to get 21/ 1

*September 6, 2016*

**Fractions**

6 divided by 2/7

*September 6, 2016*

**Algebra**

A 12-acre piece of land is subdivided into 4/5 acre lots. How many lots are there?

*September 6, 2016*

**Algebra**

A 12-acre piece of land is subdivided into 45 acre lots. How many lots are there?

*September 6, 2016*

**Fractions**

2/3 times 5/7

*September 6, 2016*

**Algebra**

Reduce 134/34 to lowest terms.

*September 6, 2016*

**Fractions**

a bag of candy holds exactly 1/4 pound of candy. How many of these bags can be filled from 9 pounds of candy?

*September 6, 2016*

**math**

Home Center sells rectangular picture frames. The ratio of the length to the height in centimeters is 7:5. What would be the length of a frame that is 15 centimeters high?

*September 5, 2016*

**calculus**

If F(x) = f(xf(xf(x))), where f(1) = 4, f(4) = 6, f '(1) = 4, f '(4) = 5, and f '(6) = 6, find F '(1).

*September 5, 2016*

**calculus**

Determine the points in the interval (0, 2π) at which the graph of the function below has a horizontal tangent line. f(x) = 10 cos x + 5 sin 2x There should be three

*September 4, 2016*

**calculus**

The graphs of f and g are shown. Let h(x) = f(g(x)) and s(x) = g(f(x)). f(-1)= 4 f'(x)=1 g(-1)=5 g'(-1)=-1/2 f(8)= 6 f'(x)= 2 g(x)= 2 g'(x)=-1/2 (a) Find h'(−1). (b) Find s'(8).

*September 4, 2016*

**calculus**

94 is not right

*September 4, 2016*

**calculus**

If F(x) = f(xf(xf(x))), where f(1) = 4, f(4) = 6, f '(1) = 4, f '(4) = 5, and f '(6) = 6, find F '(1).

*September 4, 2016*

**calculus**

Find the vertical tangents of f(x)=10 cos x + 5 sin 2x

*September 4, 2016*

**Math**

The sum of the opposite of a number and the absolute value of the number is equal to the number itself.True,sometimes true,never true?

*September 4, 2016*

**Math**

The sum of the opposite of a number and the absolute value of the number is equal to the number itself. True,sometimes true,or never true?

*September 4, 2016*

**Electricity and Magnetism**

In a thundercloud there are two equal and opposite charges ±35C separated by 6km. Assuming that they can be treated as point charges, what is the magnitude of the electric force between them?

*September 2, 2016*

**math**

An ant starts at position (0, 0) and walks north, east, south or west, one unit at a time. How many dierent paths of length 8 units finish at (0, 0)?

*August 31, 2016*

**PHYSICS**

JOHN WANTS TO PADDLE HIS CANOE ACROSS A RIVER THAT IS 200M WIDE, HE STARTS FROM THE EAST SIDE. THE WATER CURRENT FLOWS NORTH-SOUTH AT 0.5MS^-1. IT TAKES JOHN 252S TO CROSS THE RIVER. 1. DRAW A DIAGRAM TO GRAPHICALLY REPRESENT THE VELOCTY VECTORS OF THE WATER CANOE AND THEIR ...

*August 28, 2016*

**Algebra 1**

1. 4f (5)+7 2. F(X)=2x-6 3. g(X)= x^2-x-x-9 4. h(x)=4-X

*August 27, 2016*

**biology**

Which organelle(s) are likely to be involved in the reduced efficiency of amino acid recycling in wimpys liver cells?

*August 25, 2016*

**PHYSICS**

A bucket containing cement has a mass of 3kg. One end of a rope is attached to the handle of the bucket and the other end is wound around a horizontally mounted cylinder on frictionless bearings. The mass of cylinder is 6kg and its radius is 0.10m. The moment of inertia of the...

*August 24, 2016*

**math**

90%

*August 22, 2016*

**Math**

Where would I put parentheses in this problem to make it correct: 8+4x2+7divided by3=20

*August 15, 2016*

**algebra**

You want to celebrate all of your recent successes. You decide to reward yourself and a special someone with a vacation to a destination of your choosing. For your trip you will need to stay in a hotel/resort and rent a car. You decide to rent a car for the duration of your ...

*August 13, 2016*

**Biochemistry**

Calculate the mass (in g) of solid potassium hydroxide required to prepare: a) 1.75 litres of a solution with pH 11.5

*August 3, 2016*

**Chemistry**

Thanks DrBob222!

*July 29, 2016*

**Chemistry**

Could you please help me answer this question....

*July 29, 2016*

**Chemistry**

What are 2 allotropes of carbon? Could you please compare the physical and chemical properties....

*July 29, 2016*

**Chemistry**

Thanks!

*July 29, 2016*

**Algebra**

Write the equation of a line that contains (-8,4) and the midpoint of the segment connecting (-10,5) and (-5,0) in standard form. I'm not sure what I'm doing wrong. I found the midpoint (-7.5, -3.5), found the slope, and put the equation in standard form. I got x + y...

*July 27, 2016*

**maths**

simplify 6x+4y*-3x+5x-2x*3y

*July 24, 2016*

**Calculus**

Evaluate the definite Integral Integral [0 to pi/4] cos(2x)sec^2(pi/4 sin(2x))dx

*July 7, 2016*

**Calculus**

use te fundamental theorem of calculus to evaluate the integral Integral [0, pi/3] sin^2(x)dx I'm confused on what F(x) should be

*July 7, 2016*

**math**

I solved it by myself . . . thanks fir the little tip. The answer is 25.

*July 7, 2016*

**AP Chemistry**

Can anyone explain how to find potential of the cell?

*July 6, 2016*

**Chem**

Thank you Just one more question Why is it (63.55/2) g Cu ?

*July 5, 2016*

**Chem**

Can someone please explain how to tackle this problem? Cu - Anode electrode Zn - Cathode electrode A current of 2 amps is sustained for 16 minutes. what mass of Cu(s) is deposited on the zinc electrode? (Faradays' constant: 96500 C/mol e-)

*July 5, 2016*

**chem**

(sorry - accidentally posted it as physics problem) Can someone please explain how to tackle this problem? Cu - Anode electrode Zn - Cathode electrode A current of 2 amps is sustained for 16 minutes. what mass of Cu(s) is deposited on the zinc electrode? (Faradays' ...

*July 5, 2016*

**Physics**

Can someone please explain how to tackle this problem? Cu - Anode electrode Zn - Cathode electrode A current of 2 amps is sustained for 16 minutes. what mass of Cu(s) is deposited on the zinc electrode? (Faradays' constant: 96500 C/mol e-) Please and thank you!!

*July 5, 2016*

**Probability and statistic**

Suppose X has an exponential distribution with mean equal to 13. Determine the following: (a) Upper P left-parenthesis x greater-than 10 right-parenthesis (Round your answer to 3 decimal places.) (b) Upper P left-parenthesis x greater-than 20 right-parenthesis...

*July 1, 2016*

**probability and statistic**

Suppose that the number of asbestos particles in a sample of 1 squared centimeter of dust is a Poisson random variable with a mean of 1000. What is the probability that 10 squared centimeters of dust contains more than 10090 particles? Round your answer to 3 decimal places.

*July 1, 2016*

**Calculus**

Yeah That's where I was confused.Probably. Thank you!

*June 30, 2016*

**Calculus**

Okay thanks! I have drawn my graph like that!

*June 30, 2016*

**Calculus**

Wait the Points are (-1,0) (0,0) and (1,0). Im confused since the critical points and these points are both at x=-1, x=1

*June 30, 2016*

**Calculus**

Yes, I was confused why x=-1 and x=1 had two different points. Maybe it's a typo?

*June 30, 2016*

**Calculus**

Sketch the graph of the function that has the following properties. f is continuous on (-infinity, infinity). points: (-1,2), (0, 0), (-1,0) f'(x)>0 at (-infinity, -1) f'(-1)=0 f'(x)<0 at (-1, 1) f'(1)=0 f'(x)>0 on (1, infinity) f"(x)<0 on...

*June 30, 2016*

**Calculus**

A printed page is to have 1.5 inches margin on all sides. The page should contain 144 square inches of type. What dimension of the page will minimize the area while still meeting these other requirements?

*June 29, 2016*

**calc**

Find the volume of the solid generated by revolving the region bounded by y=e^(5/2x),y=0,x=1, and x=5 about the x-axis.

*June 29, 2016*

**calc**

Find the volume of the solid generated by revolving the given region in the 1st quadrant about the y-axis: y=10x^2,x=0,y=810.

*June 29, 2016*

**calculus**

Find the volume generated by revolving about the x-axis the region bounded by the following curves y=sqrt/(4x+3),x=0,x=4, and y=0. (Use "pi" for π).

*June 29, 2016*

**CALC**

Find the volume of the solid obtained by revolving the region bounded by y=(19/3)x-(19/3)x^2 and the x-axis around the x-axis. Keep answer in terms of pi PLease explain each step

*June 29, 2016*

**Probability and statistic**

The time until recharge for a battery in a laptop computer under common conditions is normally distributed with mean of 270 minutes and a standard deviation of 50 minutes. a) What is the probability that a battery lasts more than four hours? Entry field with incorrect answer (...

*June 27, 2016*

**CALC**

my equation was y=900+C/e^(1/150)t

*June 26, 2016*

**CALC**

A 200-gallon tank is currently half full of water that contains 50 pounds of salt. A solution containing 1 pounds of salt per gallon enters the tank at a rate of 6 gallons per minute, and the well-stirred mixture is withdrawn from the tank at a rate of 6 gallons per minute. ...

*June 26, 2016*

**Probability and statistics**

Astronomers treat the number of stars in a given volume of space as a Poisson random variable. The density in the Milky Way Galaxy in the vicinity of our solar system is 1 star per 16 cubic light years. (a) What is the probability of 3 or more stars in 16 cubic light years? (b...

*June 23, 2016*

**probability and statistic**

Heart failure is due to either natural occurrences (85%) or outside factors (15%). Outside factors are related to induced substances or foreign objects. Natural occurrences are caused by arterial blockage, disease, and infection. Assume that causes of heart failure between ...

*June 23, 2016*

**math**

If you will triple the three it is called thrice but when you four what is it

*June 22, 2016*

**Chemistry**

Is NH4+ polar or non polar?

*June 21, 2016*

**chemistry**

Is NH4+ po;ar or non polar?

*June 21, 2016*

**CALC**

the exponent is (y-x^2)

*June 21, 2016*

**CALC**

Find the particular solution of the given differential equation dydx=−4xe(y−x^2);y=11whenx=1. THanks

*June 21, 2016*

**CALCULUS**

Yes but I'm not sure what the m>0 is for

*June 20, 2016*

**CALCULUS**

Let y(t) denote the mass of a radioactive substance at time t.t. Suppose this substance obeys the equation y′(t)=−14y(t). Assume that, initially, the mass of the substance is y(0)=M>0. At what time does half of the mass remain? (Round your answer to 3 decimal ...

*June 20, 2016*

**CALC PLEASE HELP**

Suppose that y′=ky, y(0)=7, and y′(0)=4. What is y as a function of t ? PLEASE EXPLAIN

*June 20, 2016*

**CALCULUS**

∫4x^−1*sin(ln(6x))dx I got 4*[-cos(ln(6x))]+C but its wrong and im not sure why... Please Help!! Thanks

*June 16, 2016*

**CALC**

Find the area of the region bounded by: y=2x−tan0.18x, x=1, x=5, y=0 Round your answer to 3 decimal places. I get 9 but its wrong! please help

*June 16, 2016*

**Calculus**

to make it continuous f(2)=a so it would equal -1?

*June 16, 2016*

**Calculus**

So a=-1 That makes sense because it's continuous

*June 16, 2016*

**Calculus**

find the value of a, if it exists, such that the following function is continuous at X = 2. piecewise function f(x)={x^2-3x+1, if x>2; a, if x=2; 3-2x, if x<2 I found the limits from left and right of 2 = -1 so the limit exists but I don't know how to figure out a

*June 16, 2016*

**Math**

Among a group of people, 10% are from NYC and 90% are not. All people from NYC are under 18 years old, and 70% of those not from NYC are also under 18 years old. One person is chosen at random, and he or she is under 18. What is the probability that the person chosen is from ...

*June 15, 2016*

**CALCULUS**

Find the derivative of y=4sinx−2cosx

*June 15, 2016*

**Business Math**

How long will it take for an investment to double at 7% p.a compounded monthly?

*June 14, 2016*

**Calc**

Find the derivative of y=4sinx−2cosx

*June 13, 2016*

**Calculus**

let f(x)=2x-7. Use the rigorous definition of limit to show that lim x-->4 f(x)=1

*June 13, 2016*

**English**

Can you summarize this case study 300 words minimum? Overview Hospital A: Porter Regional Medical Center (PRMC) Located on the east side of town, Porter Regional Medical Center (PRMC) was a for-profit hospital, consisting of 110 hospital beds, 8 of which were reserved for ...

*June 9, 2016*

**geography**

Under the Soviet system, the government a. controlled all forms of communication. b. allowed newspapers to print whatever they wanted. c. controlled editorials but not the reporting of news. d. encouraged access to a wide variety of news sources.

*June 9, 2016*

**math**

Find each value if cos A=12/13 with 0 (degrees) <= A <= 90 (degrees) and if sin B=8/17 with 90 (degrees) <= B <=180 (degrees) 1. sin(A+B) 2. cos(A-B) 3. tan(A-B)

*June 6, 2016*

**Teachers aide**

What are two types of wheelchairs used by the physically challenged students are the ?I think the two would be a orthosis and the power driven

*June 3, 2016*

**Geometry**

31.Identify the Hypothesis of the statement below. If you are riding on a train, then it will stop at every station on the line. A.You are riding on a train B.It will stop at every station on the line C.You are not riding on a train D.It will not stop at every station on the ...

*June 2, 2016*

**Math**

15 blocks

*May 25, 2016*

**math plz help my last chance to do this homework**

how do you post a pic

*May 25, 2016*

**math plz help my last chance to do this homework**

a) write an expression in simplest form for the perimeter of each triangle. b)write another expression in simplest form that shows the difference between the perimeter of the larger triangle and the perimeter of the smaller triangle.

*May 25, 2016*