Average Costs per Mile Suppose that a certain car has the following average operating and ownership costs.
Operating
$0.28
a. If you drive 30,000 miles per year, what is total annual expense for this car?
Ownership
$0.74
Total
$1.02
int
n
b. If the total annual expense for this car is deposited at the end of each year into an IRA paying 7.8% compounded yearly, how much will be saved at the end of nine years? Use the formula A=-
r
n
a. If you drive 30,000 miles per year, the total annual expense for this car is $
(Round to the nearest dollar as needed.)
b. If the total annual expense for this car is deposited at the end of each year into an IRA paying 7.8% compounded yearly, the amount saved at the end of nine years is $0
(Round to the nearest dollar as needed.)

c

step-by-step explanation:

(b) 240

step-by-step explanation:

first, we use the pythagorean formula using the given side lengths to find x. then we use x to find the side lengths. then we add the side lengths to find the perimeter.

pythagorean theorem formula:

a^2 + b^2 = c^2

(x - 20)^2 + (x - 40)^2 = x^2

x^2 - 40x + 400 + x^2 - 80x + 1600 = x^2

x^2 -120x + 2000 = 0

(x - 100)(x - 20) = 0

x - 100 = 0 or x - 20 = 0

x = 100 or x = 20

we see that the solution x = 20 must be discarded because it will give a negative side length and a side length of 0. the only valid solution is x = 100.

perimeter = sum of the lengths of the sides

perimeter = x + x - 20 + x - 40

perimeter = 3x - 60

replace x with 100.

perimeter = 3(100) - 60

perimeter = 300 - 60

perimeter = 240

step-by-step explanation: