Differentiate.y = 7x(6x4 - 3x)
A. 
= 168x4 - 42x
B. 
= 210x4 - 42x
C. 
= 168x4 - 21x
D. 
= 210x4 - 21x
Answer: B
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Simplify. Assume that variables can represent any real number.
A. 8xy
B. 8xy
C. 8x2y
D. 5xy
Answer the questionSuppose z varies directly as the square of x and inversely as y. If x is halved and y is tripled, what happens to z?
A. z is six times as large as before
B. z is multiplied by 
C. z is one-sixth as large as before
D. z is one-twelfth as large as before
Perform the conversion. Round to the nearest hundredth when necessary.4.2 m to in.
A. 1066.8 in. B. 165.48 in. C. 13.78 in. D. 15.37 in.
Solve the problem.A box with an open top is formed by cutting squares out of the corners of a rectangular piece of cardboard and then folding up the sides. If x represents the length of the side of the square cut from each corner, and if the original piece of cardboard is 15 inches by 12 inches, what size square must be cut if the volume of the box is to be 176 cubic inches? 
A. 8 in. by 8 in. square B. 11 in. by 11 in. square C. 2 in. by 2 in. square D. 4 in. by 4 in. square