Solve the problem.Given cos 30° = 
, use trigonometric identities to find the exact value of sin 30°.
A. 2
B. 
C. 2
D. 
Answer: D
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Provide an appropriate response.The formula for calculating depreciation using the straight-line method is cost minus salvage value divided by the number of years of expected life.
A. True B. False
Graph the linear inequality.x ? 4
A. 
B. 
C. 
D. 
Write the mixed number as an improper fraction.7
A. 
B. 
C. 
D. 
A hygrothermograph is used by the weather services to record temperature and relative humidity (see figure labeled "Hygrothermograph"). The lower part of the graph is used to measure relative humidity from 0% to 100%. The upper part of the graph is used to measure temperature from 10° F to 110° F. What was the temperature at 2:00 a.m.? Use the data in the figure to answer this question.
A. 84° F B. 72° F C. 81° F D. 70° F E. 76° F