# Posts by Sarah

Total # Posts: 5,781

**calculus and chemistry**

Thank you so much I realized I was missing the -5 at the end

**calculus and chemistry**

A container of hot liquid is placed in a freezer that is kept at a constant temperature of 10°F. The initial temperature of the liquid is 160°F. After 5 minutes, the liquid's temperature is 60°F. How much longer will it take for its temperature to decrease to ...

**calculus**

A container of hot liquid is placed in a freezer that is kept at a constant temperature of 10°F. The initial temperature of the liquid is 160°F. After 5 minutes, the liquid's temperature is 60°F. How much longer will it take for its temperature to decrease to ...

**English**

How do i correct this? She wants pink and gray curtains in her bedroom I believe blue and white would be prettier.

**English**

Is this correct? Carol couldn't start the car after leaving the football game. Fortunately, however, Roger came along and spotted the trouble quickly.

**FRENCH**

MERCI MmeJMcGin!

**FRENCH (:**

Did I word the wordings right and is #3 & #4 in its right simple future and is #5 is in its proper conditional form? I'd appreciate the help!

**FRENCH**

1. Quel travail voulez-vous? (What job do you want?) - Je veux être un pédiatre . 2. Quel type d'education avez-vous recu? (What kind of education have you received? - I got my M.D in med school and finished pediatric residency. J'ai obtenu mon M.D à...

**American Government**

Where can the strengths of the Articles of Confederation be seen in the Constitution? A) The constitution allows states the ability to control most of their own affairs. B) The constitution allows states the power to tax citizens. C) the constitution allows states the ability ...

**algebra**

How do you write 4.2 x 10 to the 5th power in standard form?

**Algebra**

Use the properties of exponents to simplify the following expression. Write the answer in scientific notation. (5.6x10^5) (9.9x10^-8) divided by (8.4x10^-4) (5x10^6) =28.9x10^-1 I added 5.6 9.9 8.4 5 5+-8+-4+6+ -1

**Algebra**

would my answer be 6,761,*10^6 or 6,761,*10^7 both saying its wrong

**Algebra**

Write the number in scientific notation. 6,761,000 I said it was 6,761,*10^3 Its saying its wrong?

**Algebra**

so the answer would be 630,*10^9? or 630,*10^8 becuase 6.2x 10^8 it is saying its wrong.

**Algebra**

If you are 20 years old,you have been alive for more than 630,000 seconds,write the last number in scientific notation? 630,000,000 I said it was 630,*10^7 idk how its wrong!

**Algebra**

(9x10^8)(3x10^3) what I did was 9 times 3 got 27x. Then did 8+3=11. Put it all together and got 27x10^11. Its saying it is wrong though

**Algebra**

A light year, the distance light travels in 1 year, is approximately 5.9×10^12 miles.A nearby galaxy is approximately 1.2×10^7 light years from our galaxy. Find the distance in miles between our galaxy and the nearby galaxy. IDK this question. I first thought you ...

**Algebra**

Write the following number in scientific notation. 0.157 I thought the answe was 0.157x10^3. it is wrong need help! No idea how its wrong

**Algebra**

Write the following number in scientific notation. 50,800 I thought the answer was 50.8x10^4 Need help

**Homework**

I will call you when I will get back from visiting my sister. will/get back/visiting find a incorrect answer? will is incorrect here?

**Algebra**

Steve I watched a example with one that had nothing in front. So it threw me off because I tried to follow that example and steps. Thank you for your help

**Algebra**

5-2 [5(-2)+4(2)/ -3(3)+3(-4)] my work : I did 5(-2) + 4(2) and -10 +8 then the bottom _9 (-12) = -2/-24 I need major help! Don't know what to do with 5-2 even.

**Algebra**

2^-1+4^-5 I thought 5/8 but its wrong. help please

**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!

**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

**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.

**Math**

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

**English**

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

**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?

**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."

**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

**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 ...

**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

**Fractions**

would the answer be 32/3? Not sure

**Fractions**

4/3 divided by 1/8

**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?

**Fractions**

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

**Fractions**

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

**Fractions**

3/4 times 4/3

**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.

**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

**Fractions**

6 divided by 2/7

**Algebra**

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

**Algebra**

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

**Fractions**

2/3 times 5/7

**Algebra**

Reduce 134/34 to lowest terms.

**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?

**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?

**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).

**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

**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).

**calculus**

94 is not right

**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).

**calculus**

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

**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?

**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?

**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?

**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)?

**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 ...

**Algebra 1**

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

**biology**

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

**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...

**math**

90%

**Math**

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

**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 ...

**Biochemistry**

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

**Chemistry**

Thanks DrBob222!

**Chemistry**

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

**Chemistry**

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

**Chemistry**

Thanks!

**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...

**maths**

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

**Calculus**

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

**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

**math**

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

**AP Chemistry**

Can anyone explain how to find potential of the cell?

**Chem**

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

**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-)

**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' ...

**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!!

**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...

**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.

**Calculus**

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

**Calculus**

Okay thanks! I have drawn my graph like that!

**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

**Calculus**

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

**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...

**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?

**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.

**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.

**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).

**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

**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 (...

**CALC**

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

**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. ...

**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...

**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 ...

**math**

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

**Chemistry**

Is NH4+ polar or non polar?

**chemistry**

Is NH4+ po;ar or non polar?