Use an associative property to complete the statement. Do not simplify.a ? (2x) = 
A. (2x) ? a
B. (a ? 2) ? x
C. (a ? 2) + x
D. a ? (x ? 2)
Answer: B
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Solve the problem.A spring on a horizontal surface can be stretched and held 0.5 m from its equilibrium position with a force of 50 N. How much work is done in compressing the spring 1.5 m from its equilibrium position?
A. 37.5 J B. 225 J C. 112.5 J D. 75 J
Solve the problem.An object is propelled vertically upward from the top of a 96-foot building. The quadratic function 
models the ball's height above the ground, 
in feet, t seconds after it was thrown. How many seconds does it take until the object finally hits the ground? Round to the nearest tenth of a second if necessary.
A. 2 seconds B. 3.5 seconds C. 7.8 seconds D. 0.8 seconds
Multiply.× 
A. 524.16 B. 525.26 C. 80 D. 524.27
Establish the identity.csc u - sin u = cos u cot u
What will be an ideal response?