Please answe those 2 questions

X C @ Question 17 Solve the problem. If the price charged for a candy bar is p(x) cents, then x thousand candy bars will be sold in a certain city, where p(x) = 67 - . How many candy bar must be sold to maximize revenue? 2010 thousand candy bars 2010 candy bars 1005 candy bars 1005 thousand candy bars Question 18 Find dy. y = csc(6x2 - 1) O dy = -6x2 csc(6x2 - 1) cot(6x2 - 1) dx O dy = -12x csc(12x) cot(12x) dx O dy = -12x csc(6x2 - 1) cot(6x2 - 1) dx O dy = 12x csc(6x2 - 1) cot(6x2 - 1)dx DELL