If gas costs $3.65 per gallon at a local service station, how many cubic feet of gas can a customer buy with $40 ?

- anonymous

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- precal

40/3.65=10.95 gallons

- anonymous

how far can the customer drive if the car gets 4 miles per cubic foot of gas?

- precal

4 miles per gallon??? Horrible mileage.....

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- anonymous

the first answer was rejected, the 10.95

- anonymous

they want the answer in ft^3, i guess

- precal

weird.... I was just thinking of it like in the real world.
I have $40 dollars and I can only by approx 10.9 gallons at 3.65
maybe you need to input it as 10.9 (do you have instructions on what place to round to?)

- anonymous

no.

- anonymous

well can you help me with 4 other questions please

- anonymous

i have this
The compound interest formula is F = P(1 + i)^n where F is the total amount due, P is the initial cost or amount of money, i is the interest rate, and n is the number of periods interest is computed. A student purchases a $1300 laptop computer for school. The deal does not require payment until 2 years later. If interest is computed monthly, how much does the student have to pay at the end of 2 years? The monthly interest rate is 1.8 percent.

- precal

ok I will try, what do you have?

- precal

P=1300
i=.018
n = 12 because it is monthly
but n = 24 because of 2 years
F=1300(1+.018)^24
compute F

- anonymous

did you get 1994?

- precal

and 76 cents

- precal

That would be a bad deal,
that means that person is willing to pay 694.76 to borrow 1300

- precal

yes 1994.76

- anonymous

my damn software rejected the answer

- precal

I still think the directions somewhere has to say how to input the solutions. Decimals are tricky. I am given you real world solutions but if the instructions are to round to the nearest whole number 1995 would be the only accepted answer.

- anonymous

ok what about this one
A copper pipe, used for plumbing from the water main to a house, is 5 meters long and has a circular cross-section 3.2 cm in diameter. There is a 2.4 cm diameter hole in the center of the cross-section for the entire length of the rod. What is the volume of copper in the rod in cubic inches?

- precal

were you given a picture? Upload it by attaching the file.

- anonymous

##### 1 Attachment

- anonymous

yea theres the picture for the last problem

- precal

V=Bh
B is a circle
so B is pi(r^2)
\[V=\pi r^2h\]

- anonymous

so v=pi(5^2)(3.2)?

- precal

picture stated 1 gallon = 231 cubic inch
we sort of needed that info earlier

- anonymous

oh sorry

- precal

|dw:1328667396808:dw|

- precal

original solution is 10.95*231=2529.45 cubic inches

- precal

|dw:1328667597151:dw|
I think you will have a circle within a circle, but you should not be using diameter.
Take half of the diameter and that is your radius

- anonymous

3.2/2=1.6, is that right

- precal

yes if d=3.2 then r = 1.6

- anonymous

so is h the 2.4?

- precal

no 5 is the height (it you stand the pipe up you will see that it is 5)

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