Find an equation of variation in which the following are true.y varies jointly as x and z, and y = 80 when x = 8 and z = 5
A. y = 10x
B. y = 
C. y = 2xz
D. y = 4xz
Answer: C
Mathematics
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Solve the problem.If 5 apples in a barrel of 25 apples are rotten, what is the expected number of rotten apples in a random sample of 2 apples?
A. 
B. 1
C. 
D. 
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Solve.The temperature was 61°F in the morning, but it dropped 19°F in the afternoon and another 5°F in the evening. What was the temperature in the evening?
A. 37°F B. -47°F C. -37°F D. 47°F
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Find the weekly gross earnings. Overtime is paid at the time-and-a-half rate for hours over 40 per week.
A. $778.75 B. $823.25 C. $689.75 D. $831.25
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Multiply. Simplify the answer completely.- 
? 
A. - 
B. 
C. - 
D. 
Mathematics