Hi I need help on number one number two and number three . I need step-by-step how I get the answer thank you

MATH 236 Exam 4 SHOW ALL YOUR WORK ON A SEPARATE PIECE OF PAPER Solve the problem. PLEASE DO NOT WRITE ON THIS PAGE!! 1) The total cost, in dollars, to produce x DVD players is C(x) = 90 + 7x - x3 + 6x]. Find the marginal cost whin x = 5 2) A company wishes to manufacture a box with a volume of 28 cubic feet that is open on top and is twice as long as it is wide. Find the width of the box that can be produced using the minimum amount of material 3 A company estimates that the daily cost (in dollars) of producing x chocolate bars is given by C(x) = 1410 + 0.04x + 0.0002x2. Currently, the company produces 690 chocolate bars per day. Use marginal cost to estimate the increase in the daily cost if one additional chocolate bar is produced per day. Find Ay and f "(x) Ax for the given function. dy=(x)=x x = 0. and Ax = 0.05 Differentiate. 203+ 1 Find the indicated tangent line. 6) Find the tangent line to the graph of fix) = ex at the point (0. 1)