# Posts by jer

Total # Posts: 26

**Calculus I**

The area enclosed by the curve y^2 = x(2 − x) is given by what definite integral? Should I begin by square rooting both sides? Not really sure.

*April 22, 2016*

**Calculus I**

I meant to phrase the question as, "What integral represents the volume of the solid formed by revolving the region bounded by the graphs of y =x^3, y = 1, and x = 2, about the line x = 2?"

*April 22, 2016*

**Calculus I**

Which of the following represents the volume of the solid formed by revolving the region bounded by the graphs of y =x^3, y = 1, and x = 2, about the line x = 2?

*April 22, 2016*

**Calculus I**

The base of a solid is the circle x^2 + y^2 = 9. Cross sections of the solid perpendicular to the x-axis are squares. What is the volume, in cubic units, of the solid?

*April 22, 2016*

**Calculus I**

Find the volume of the solid formed by rotating the region bounded by the graph of y equals 1 plus the square root of x, the y-axis, and the line y = 3 about the x-axis.

*April 22, 2016*

**trigonometry**

the base of an isosceles triangle measures 108 feet and forms an angle of 55 degrees with one equal sides. find the perimeter of the triangle

*January 3, 2016*

**chemistry**

calculate the mass in grammes of copper that will be deposited by dissolving 6.5g of zinc in copper tetraoxosulphate(vi) solution

*November 8, 2015*

**algebra**

A marketing company asked 100 people whether they liked a new skin cream and lip balm. The company found that 80% of the people who liked the new skin cream also liked the new lip balm, and that 50% of the people who did not like the new skin cream liked the new lip balm. If ...

*November 27, 2014*

**algebra**

A goldsmith has two gold alloys. The first alloy is 30% gold; the second alloy is 80% gold. How many grams of each should be mixed to produce 10 grams of an alloy that is 40% gold? amount of 30% gold ___ g amount of 80% gold ___ g

*November 27, 2014*

**algebra**

A motorboat traveling a distance of 225 miles in 5 hours while traveling with the current. Against the current, the same trip took 9 hours. Find the rate of the boat in calm water and the rate of the current. rate of boat mph rate of current mph

*November 23, 2014*

**algebra**

Solve by using a system of equations. The number x of MP3 players a manufacturer is willing to sell is given by x = 20p − 1500, where p is the price, in dollars, per MP3 player. The number x of MP3 players a store is willing to purchase is given by x = −4p + 900, ...

*November 23, 2014*

**algebra**

Flying with the wind, a plane traveled 390 miles in 3 hours. Flying against the wind, the plane traveled the same distance in 5 hours. Find the rate of the plane in calm air and the rate of the wind. rate of plane ? mph rate of wind ? mph

*November 23, 2014*

**Biology**

Thanks dude!

*March 9, 2014*

**Linear Algebra - Question**

I have this number that I just wanted to be sure how to do. They give me a Parallelepiped with corners lettered from A to H. Then the question is: In a certain orthonormal reference, the coordinates of points A, B, D and E are respectively A(0,0,2) B(3,0,2) D(0,4,2) E(0,0,1) ...

*April 30, 2012*

**Linear Algebra - Question**

I have this number that I just wanted to be sure how to do. They give me a Parallelepiped with corners lettered from A to H. Then the question is: In a certain orthonormal reference, the coordinates of points A, B, D and E are respectively A(0,0,2) B(3,0,2) D(0,4,2) E(0,0,1) ...

*April 29, 2012*

**Linear Algebra - Question**

I have this number that I just wanted to be sure how to do. They give me a Parallelepiped with corners lettered from A to H. Then the question is: In a certain orthonormal reference, the coordinates of points A, B, D and E are respectively A(0,0,2) B(3,0,2) D(0,4,2) E(0,0,1) ...

*April 29, 2012*

**Differential Calculus**

thanks!

*April 28, 2012*

**Differential Calculus**

y = 1 + (x-1)^(1/2) Considering the interval (2,4), calculate delta(y) and dy. would delta(y) be: delta(y) = f(4) - f(2) = (1 + squr(3) ) - 2 = squr(3) - 1 and dy is 1/(2 squr(x-1)) dx Thank you

*April 28, 2012*

**math 118**

a. Suppose a market research company finds that at a price of p = $6., they would sell x = 44 tiles each month. If they lower the price to p = $2, then more people would purchase the tile, and they can expect to sell x = 48 tiles in a month’s time. Find the equation of ...

*February 4, 2012*

**Biology**

ahrra negros

*June 15, 2011*

**chemistry**

suppose a car operates so inefficently that only 16% of the thermal energy from burning fuel is converted to useful "wheel turning" (mechanical energy) how many kj of useful energy would be stored in a 20 gallon tank of gasoline?(assume that octane burning and gas ...

*March 31, 2011*

**Chemistry**

What is te component concentration ratio, [NO2-]/[HNO2], of a buffer that has a pH of 2.42 (Ka of HNO2=7.1 x 10^-4)?

*November 29, 2010*

**physics**

a jet plane lands with a speed of 101 m/s and can accelerate at a maximum rate of -4.60 m/s2 as it comes to rest. (a) From the instant the plane touches the runway, what is the minimum time needed before it can come to rest? ___s b)What is the actual minimum distance needed to...

*September 15, 2010*

**physics**

The speed of a nerve impulse in the human body is about 100 m/s. If you accidentally stub you toe in the dark, estimate the time it takes the nerve impulse to travel to your brain. (Assume that you are approximately 1.8 m tall and that the nerve impulse travels at uniform speed.)

*September 14, 2010*

**physics**

Traumatic brain injury such as concussion results when the head undergoes a very large acceleration. Generally, an acceleration less than 800 m/s2 lasting for any length of time will not cause injury, whereas an acceleration greater than 1000 m/s2 lasting for at least 1 ms ...

*September 14, 2010*

**calculus**

Find the equation of the tangent line to the graph of f(x)=4ln(9x+2)at the point of x-coordinate x=2.

*May 24, 2010*

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