Question

D'Andre has decided that he needs to get more exercise, so he is building a running regimen for himself. He decides that, beginning on Sunday, he'll fun 10 feet. On each subseqeunt day he'll double the distance he ran the previous day. So he'll run 20 feet on Monday, 40 feet on Tuesday, and so on. His Track coach (who also happens to be his math teacher) told D'Andre that he won't be able to keep his plan for very long, but D' Andre is determined to make it work for at least two weeks.

How far will D' Andre have to run on the 14th day? In neartest tenth of a mile. (1 mile= 5280 feet)

If he sticks to the plan how far will he have ran in those two weeks? to the nearest mile.

Is there an equation for that one?^ or do i just have to add them all up?

Answer 1

for the first part I have 10(2)^14-1 and on the 14th day he'll run about 15.5 miles, but what about the second part

Answer 2

Given that f(x) = x² + 4x, evaluate f(-2).