Write an equation to describe the variation. Use k for the constant of proportionality.w varies directly as b
A. w = 
B. w = kb
C. b = 
D. b = kw
Answer: B
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Solve the problem.The position (in centimeters) of an object oscillating up and down at the end of a spring is given by 
at time t (in seconds). The value of A is the amplitude of the motion, k is a measure of the stiffness of the spring, and m is the mass of the object. How fast is the object moving when it is moving fastest?
A. 
cm/sec
B. A cm/sec
C. A
cm/sec
D. A
cm/sec
Identify the property illustrated by the statement.9 + 0 = 9
A. Associative B. Commutative C. Distributive D. Identity E. Inverse
Solve the problem.A merchant has coffee worth $30 a pound that she wishes to mix with 20 pounds of coffee worth 
a pound to get a mixture that can be sold for 
a pound. How many pounds of the 
coffee should be used?
A. 15 pounds B. 5 pounds C. 30 pounds D. 10 pounds
Use De Moivre's theorem to evaluate the expression. Write the result in standard form.(1 + i)20
A. -1024 B. 1024 C. 1024i D. -1024i