Evaluate the expression without a calculator.(-4)-2
A. -16
B. 
C. 16
D. - 
Answer: B
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Name the property that justifies the statement. All variables represent real numbers.15 + (-16) = (-16) + 15
A. Associative property of addition B. Distributive property of multiplication over addition C. Inverse property of addition D. Commutative property of addition
Provide an appropriate response.Solve by the method of reduction: 
What will be an ideal response?
An object attached to a coiled spring is pulled down a distance a from its rest position and then released. Assuming that the motion is simple harmonic with period T, write an equation that relates the displacement d of the object from its rest position after t seconds. Also assume that the positive direction of the motion is up.a = 18;
T = 4? seconds
A. d = -4 cos 
B. d = -18 sin 
C. d = -18 cos 
D. d = -18 cos 
Solve.A musician plans to perform 7 selections. In how many ways can she arrange the musical selections?
A. 5,040 B. 7 C. 40,320 D. 49