Solve the problem.A car travels 400 miles on level terrain in the same amount of time it travels 160 miles on mountainous terrain. If the rate of the car is 30 miles per hour less in the mountains than on level ground, find its rate in the mountains.
A. 80 mph
B. 20 mph
C. 40 mph
D. 50 mph
Answer: B
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Use the shell method to find the volume of the solid generated by revolving the region bounded by the given curves and lines about the x-axis.y = 7x3, y = 7x, for x ? 0
A. 
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B. 
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C. 
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D. 
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Factor as completely as possible. If unfactorable, indicate that the polynomial is prime.16 -(x + 2y)2
A. (4 + 2xy)(4 - 2xy) B. (4 + x - 2y)(4 - x - 2y) C. (4 + x + y)(4 - x - y) D. (4 + x + 2y)(4 - x - 2y)
Identify the pairs of complementary or supplementary angles, as indicated.Complementary
A. ?CBE & ?EBA B. ?CBD & ?DBE; ?ABF & ?FBE C. ?FBE & ?EBD; ?ABF & ?CBD D. ?ABF & ?FBE
Factor out the GCF.144x9y9 - 128x7y6 - 32x2y4
A. 16x2y4(9x7y5 - 8x5y2 - 2) B. no common factor C. 16x2(9x7y9 - 8x5y6 - 2y4) D. 16(9x9y9 - 8x7y6 - 2x2y4)