Add or subtract as indicated. Write the answer in lowest terms.19
- 
A. 18
B. 18
C. 19
D. 17
Answer: B
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Simplify. Assume that all variables represent positive numbers.
A. 5xy
B. 5xy2
C. 5x2
D. 5x
Divide and reduce to lowest terms.
÷ 
A. 
B. 
C. 
D. 
Write the sample space for the given experiment.A coin is tossed, and then a die is rolled.
A. {(h, 1), (h, 2), (h, 3), (h, 4), (h, 5), (h, 6), (t, 1), (t, 2), (t, 3), (t, 4), (t, 5), (t, 6)} B. {(h, t, 1, 2, 3, 4, 5, 6)} C. {(1, h), (2, h), (3, h), (4, h), (5, h), (6, h), (1, t), (2, t), (3, t), (4, t), (5, t), (6, t)} D. {(2, 6)}
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. 3 cm B. 162 cm C. 8 cm D. 117 cm