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 13 inches, what size square must be cut if the volume of the box is to be 189 cubic inches? 
A. 4 in. by 4 in. square
B. 7 in. by 7 in. square
C. 9 in. by 9 in. square
D. 3 in. by 3 in. square
Answer: D
Mathematics
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Graph the pair of parametric equations with the aid of a graphing calculator.x = 6 cos t + 2 cos 3t, y = 6 sin t - 2 sin3t, 0 ? t ? 2?
A. 
B. 
C. 
D. 
Mathematics
Find the requested function value.(g ? f)(x): f(x) = 4x2 + 6x + 4, g(x) = 6x - 7
A. 4x2 + 6x - 3 B. 24x2 + 36x + 17 C. 24x2 + 36x + 31 D. 4x2 + 36x + 17
Mathematics
Multiply to find the exact answer. Express the answer as a whole or mixed number when possible and simplify.6 ? 3
A. 20
B. 18
C. 9
D. 20
Mathematics
Factor the expression completely, if possible.r6 + 27t3
A. (r + 3t)(r2 - 3rt + 9t2) B. (r - 3t)(r2 + 3rt + 9t2) C. (r2 - 3t)(r4 + 3r2t + 9t2) D. (r2 + 3t)(r4 - 3r2t + 9t2)
Mathematics