Factor out the greatest common factor.21m9 + 27m6 - 15m2
A. 3m2(7m7 + 9m4 - 5)
B. m2(21m7 + 27m4 - 15)
C. 3(7m9 + 9m6 - 5m2)
D. no common factor
Answer: A
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Solve the quadratic equation by factoring.2 - 10x = (3x - 7)(x + 1)
A. 
B. {-1, 3}
C. {-3, 1}
D. 
Graph the function.y = 
cos 
x
A. 
B. 
C. 
D. 
Simplify.6.92 × [(7 - 3.6) ÷ 0.04 + 0.8]
A. 4084.938 B. 40,849.38 C. 40,863.94 D. 4091.944
Solve the problem.The force acting on a pendulum to bring it to its perpendicular resting point is called the restoring force. The restoring force F, in Newtons, acting on a string pendulum is given by the formula F = mg sin?where m is the mass in kilograms of the pendulum's bob, g ? 9.8 meters per second per second is the acceleration due to gravity, and ? is angle at which the pendulum is displaced from the perpendicular. What is the value of the restoring force when m = 0.8 kilogram and ? = 45°? If necessary, round the answer to the nearest tenth of a Newton.
A. 5.5 N B. 5.3 N C. 5.6 N D. 6.7 N