Sick with Covid, but trying to keep up with class assignments . Please help I have no idea how to do these. Thanks.

10. [10.66 Point51-d 0/6 Submissions Used For which value(s) ofx does the graph of for) = x3 + 9x2 + 27x + 7 have a horizontal tangent line? (Enter your answers as a comma-separated list. If an answer does not exist, enter DNE.) x=l l [ Submit Answer : 11. [-10.66 Points] TAILS N016 Submissions Used MY NOTES For what value(s) of x is the tangent line of the graph of f(x) = 2x3 7 18x2 + 32x 7 51 parallel to the line y = 2x 7 0.7? Hint: Parallel lines must have the same slope. (Enter your answers as a comma-separated list. If an answer does not exist. enter DNE.) Submit Answer 12. [10.66 Points] DETAILS .2. me Submissions Used Find the equation of the tangent line to the curve y = x5 + Sex at the point (0, 5). Submit Answer , 13. [-10.66 Points] DETAILS Mubmissions Used Find the equation of the line tangent to the graph of y = 8 |n(x) at x = 2. : Submit Answer 14. [10.66 Points] DETAILS m 0/6 Submissions Used The cost, in dollars, of producing X coi'i'ee machines is given. (Round your answers to the nearest cent.) C(x) = 1,100 + 60x 7 0.5x1 (a) Find the exact cost of producing the 24th machine. $l (b) Use marginal analysis to approximate the cost of producing the 24th machine. is l ' r Submit Answer: 15. [10.76 Points] DETAILS _ Ol Submissions Used The profit, in dollars, of producing and selling x action figures is given. P(x) = x2 + 80x 430 MY NOTES MY NOTES MY NOTES MY NOTES (a) Find the exact profit of producing and selling the 38th action figure. (Round your answer to the nearest cent.) $i (In) Use marginal analysis to approximate the profit of producing and selling the 38th action figure. (Round your answer to the nearest cent.) sf Submit