Question

http://apcentral.collegeboard.com/apc/public/repository/_ap05_frq_calculus_ab_45483.pdf
#2 c

Answer 1

@MrDoe sorry can u help?

Answer 2

the whole thing O_o?

Answer 3

no just #2 c

Answer 4

oh, nvm hang on

Answer 5

my approach to this would be to go ahead and combine them W(t)-R(t) and evaluate it as a single function, then do a curve sketch on that interval and use points of inflection to determine where the minimum is

but you can do it more than one way

Answer 6

use the derivative tests and it will be messy but doable

Answer 7

oh ok. thanks.

Answer 8

yeah though i have to say i don't envy you that problem, looks like a pain, good luck!

Answer 9

haha thanks :)

Answer 10

This is related rates. No integrals needed.

Answer 11

oh wait, nvm haha. no1 mentioned n e thiing abt integrals here. ignore last cmnt.

Answer 12

Use first derivative and second derivative test, and plug in 0 and 18.