Solve the problem.A plane flies 400 miles with the wind and 300 miles against the wind in the same length of time. If the speed of the wind is 20 mph, what is the speed of the plane in still air?
A. 140 mph
B. 130 mph
C. 165 mph
D. 145 mph
Answer: A
Mathematics
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Solve the rational equation.
- 
= 
A. 
B. {1}
C. ?
D. 
Mathematics
Find the midpoint of the line segment whose endpoints are given.(-3, -2), (7, 7)
A. (4, 5)
B. (-10, -9)
C. 
D. 
Mathematics
Solve the formula for the indicated variable. Assume that all variables are positive.r = 
for S
A. S = 
B. S = 4?r
C. S = 16?2r2
D. S = 4?r2
Mathematics
Factor the expression. Express your answer so that only positive exponents occur. 4x1/7 - 9x-2/7
A. x1/7(4x3/7 - 9x1/3) B. x1/3(4 - 9x1/3) C. x-2/7(4x3/7 - 9) D. x-2/7(4x3/7 - 9x)
Mathematics