Find the derivative.y = 3 cos3(3x + 3)
A. -3 sin3(3x + 3)
B. -81 sin2(3x + 3)
C. 9 cos2(3x + 3) sin (3x + 3)
D. -27 cos2(3x + 3) sin (3x + 3)
Answer: D
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Find the inverse of the matrix (if it exists).A = 
A. A-1 does not exist.
B. A-1 = 
C. A-1 =
D. A-1 = 
Solve the problem.The rate of expenditure on a particular machine is given by dM/dx = 9x
, where x is time measured in years. Maintenance costs for the second year are $74. Find the total maintenance function, M.
A. M = 3(x2 + 5)3/2 + 65 B. M = 9(x2 + 5)3/2 - 7 C. M = 9(x2 + 5)3/2 + 65 D. M = 3(x2 + 5)3/2 - 7
Simplify, if possible, by combining like terms.-8y - 15y
A. 120y B. -23y2 C. 23y D. -23y
Find the product.(x2 + x - 2)(x2 + x - 8)
A. x4 + x3 + 11x2 + 10x + 16 B. x4 + 2x3 + 10x2 + 6x + 16 C. x4 + 2x3 - 9x2 - 10x + 16 D. x4 + x3 - 10x2 - 10x + 16