Evaluate.a - b ÷ c, for a = 
, b = 7, and c = 
A. 39
B. 12
C. 1
D. 13
Answer: D
Mathematics
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Express the relationship between a small change in x and the corresponding change in y in the form 
.y = 9
- 
A. dy = 
dx
B. dy = 
dx
C. dy = 
dx
D. dy = 
dx
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Solve the problem.An airplane flies 450 miles with the wind and 330 against the wind in the same length of time. If the speed of the wind is 20, what is the speed of the airplane in still air?
A. 55 mph B. 120 mph C. 135 mph D. 130 mph
Mathematics
Solve the problem. Round your answer to the nearest tenth.If $4500 is invested in an account that pays interest compounded continuously, how long will it take to grow to $13,500 at 7%?
A. 17.3 years B. 10.0 years C. 15.7 years D. 7.7 years
Mathematics
Perform the operation. Write the answer as a fraction in lowest terms.6 ? 1
A. 
B. 11
C. 
D. 
Mathematics