Simplify the fraction.
A. 
B. 
C. 
D. 4
Answer: D
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Solve.The distance D that a spring is stretched by a hanging object varies directly as the weight W of the object. If a 11-kg object stretches a spring 85 cm, find the distance when the weight is 21-kg. Round your answer to the nearest whole centimeter.
A. 117 cm B. 8 cm C. 162 cm D. 3 cm
Evaluate the piecewise-defined function at the indicated value.f(x) = 
; f(7)
A. -49 B. 9 C. 73 D. 49
Complete.0.489 mcg = 
mg
A. 48.9 B. 0.00489 C. 0.000489 D. 489
Solve the problem.In 1999 the stock market took big swings up and down. A survey of 975 adult investors asked how often they tracked their portfolio. The table shows the investor responses. What is the probability that an adult investor tracks his or her portfolio daily? 
A. 27.90% B. 24.34% C. 22.67% D. 27.59%