Multiply.(8a + 7b)(9a - 2b)
A. 72a2 + 63ab - 14b2
B. 72a2 + 47ab + 47b2
C. 72a2 + 47ab - 14b2
D. 72a2 - 16ab - 14b2
Answer: C
Mathematics
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Find the volume of the solid generated by revolving the region about the y-axis.The region in the first quadrant bounded on the left by the circle x2 + y2 = 16, on the right by the line 
, and above by the line y = 4
A. 
?
B. 64?
C. 16?
D. 
?
Mathematics
Is the ordered triple a solution to the given system of equations?(-2, 6, -1) -x + 3y + 4z = 16 3x + 2y - z = 7 4x - y + 3z = -17.
A. No B. Yes
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Solve.-6b + 8 + 4b = -3b + 13
A. b = -8 B. b = 5 C. b = -13 D. b = 13
Mathematics
Express the sum or difference as a product.cos 8x - cos 4x
A. -2 cos 6x sin 2x B. 2 cos 2x C. -2 sin 6x sin 2x D. 2 cos 6x cos 2x
Mathematics