Set up an equation that can be used to solve the problem. Solve the equation and answer the question asked. An airplane flies 480 miles with the wind and 320 against the wind in the same length of time. If the speed of the wind is 40 mph, what is the speed of the airplane in still air?
A. 205 mph
B. 190 mph
C. 200 mph
D. 80 mph
Answer: C
Mathematics
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Multiply or divide. Write any repeating decimals with as few digits as possible.50.7 ? 3.9
A. 54.6 B. 197.73 C. 197.84 D. 198.83
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Graph the function.f(x) = e5x 
A. 
B. 
C. 
D. 
Mathematics
Multiply. Change any mixed number to an improper fraction before multiplying.8 × 8
A. 64
B. 64
C. 64
D. 16
Mathematics
Solve the equation.-16 = r + 15
A. 1 B. -1 C. -31 D. 31
Mathematics