use the formula as stated, with b as 18 inches and h as 6 inches. you will get 1/2 * 18 in * 6 in, or 54 in^2.
60 children choose watermelon
300-150=150 150-90= 60
we aim to find: . using the chain rule, this is just:
now, the first part we need to find is relatively straight forward. we are given v in terms of r, so using the power rule, this gives us:
we're also given r in terms of t, so simply differentiating r wrt t gives us:
putting all of this together gives us our final piece of the puzzle:
but we don't want the rate of change to be in "r" and "t". so letting gives us: