Problem #10: Find the two x-values at which the graph of the given function has a horizontal tangent line. (a) y = (x+6)(x- + 9x + 18) (b) X V = 2x- + 6 Problem #10(2): -4,-6 Separate your answers with a comma. Do not include 'x = ' in your answer. Enter your answer as a symbolic Problem #10(b): function of x, as in these Separate your answers with a comma. examples Do not include 'x = ' in your answer. Just Save Submit Problem #10 for GradingProblem #8: It is estimated that t months from now, the number of weekly hits to a certain web site will b C(t) = 100+ + 500t + 6000. (a) Derive an expression for the rate at which the number of hits is changing with respect to time t months from now. (b) At what rate will the number of weekly hits be changing with respect to time 7 months from now? (c) By how much will the number of hits actually change during the 8th month? Enter your answer as a symbolic 300*t^2+500 function of t, as in these Problem #8(a): examples 300+ + 500 Problem #8(b): 15200 Problem #8(c): 19400 Just Save Submit Problem #8 for Grading Problem #8 Attempt #1 Attempt #2 Attempt #3 Your Answer: | 8(a) 3007 + 500 8(a) 8(a) 8(b) 15200 8(b) 8(b) 8(c) 19400 8(c) Your Mark: | 8(a) 2/2 8(a) 8(a) 8(b) 2/2 J 8(b) 8(b) 8(c) 0/2X 8(c) 8(c)