# Posts by Sarah

Total # Posts: 5,982

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 di erent 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%

Language Arts, help a.s.a.p.
The first one is actualy falling action

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

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

Chemistry
Where

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?

CALC
the exponent is (y-x^2)

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

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

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 ...

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

CALCULUS

CALC

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

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

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

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 ...

CALCULUS
Find the derivative of y=4sinx−2cosx

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

science
You know you dont need to copy, you can just take the main ideas, and then use your own words to describe thats what I ussually do.

Calc
Find the derivative of y=4sinx−2cosx

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

economics
How do you think the Demand and Supply patterns have changed in the United States since 2008 when the recession started?

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 ...

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.

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)

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

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 ...

Math
15 blocks

math plz help my last chance to do this homework
how do you post a pic

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.

Algebra
i think a is right

Algebra
Randall wants to mix 41 lb of nuts worth ​\$2 per lb with some nuts worth ​\$8 per lb to make a mixture worth ​\$7 per lb. How many pounds of ​\$8 nuts must he​ use? Pounds of nuts-cost per pound-total cost 41-\$2-? x-\$8-? ?-\$7-? There is a chart and I...

Algebra
A chemist wishes to mix a solution that is 4​% acid. She has on hand 66 liters of a 2​% acid solution and wishes to add some 8​% acid solution to obtain the desired 4​% acid solution. How much 8​% acid solution should she​ add? There is a ...

Algebra
The height of Tower A is 940 feet more than Tower B. The two towers have a combined height of 1,540 feet. What are the heights of each​ tower?

What is the electrostatic force between one object with a charge of +5.0 × 10−6 C, and a second object with a charge of +2.0 × 10−6 C? The objects are 1.2 meters apart. In a pith ball experiment, the two pith balls are at rest. The magnitude of the ...

URGENT HELP
1.In a pith ball experiment, the two pith balls are at rest. The magnitude of the tension in each string is |T| = 0.55 N, and the angle between each string and a vertical line is θ = 27.33°. What are the values for the magnitudes of electrostatic force, Fq, and the ...

Physics
@bobpursley

Physics
One object has a charge of +5.0 × 10−6 C, and a second object has a charge of +2.0 × 10−6 C. The objects are 0.5 meters apart. What is the electrostatic force between them?

College Algebra
Pounds of nuts-cost per pound-total cost 41-\$2-? x-\$8-? ?-\$7-? There is a chart and I have to fill in the question marks. x= 205/6 0r 34.16667

College Algebra
Randall wants to mix 41 lb of nuts worth ​\$2 per lb with some nuts worth ​\$8 per lb to make a mixture worth ​\$7 per lb. How many pounds of ​\$8 nuts must he​ use?

Chemistry
Calculate H2 Equation 1- CH4g+2O2g+CO2g+2H2OgH1=-890kj Equation 2- CH4g+O2g+CH2Og+H2OgH2=? Equation 3- CH2Og++O2g+CO2g+H20gH3=-518kj