Solve the problem.A plane flies 440 miles with the wind and 300 miles against the wind in the same length of time. If the speed of the wind is 21 mph, what is the speed of the plane in still air?
A. 136 mph
B. 116 mph
C. 101 mph
D. 111 mph
Answer: D
Mathematics
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Indicate whether the number is a proper fraction, an improper fraction, or a mixed number.
A. mixed number B. proper fraction C. improper fraction
Mathematics
Find the slope of the line.
A. -2
B. 
C. 2
D. - 
Mathematics
Determine the equation of the line described. Put answer in the slope-intercept form, if possible.Through (3, -8), perpendicular to 8x + 9y = -48
A. y = - 
x + 
B. y = 
x - 
C. y = 
x
D. y = 
x + 91
Mathematics
Solve the system by back substitution.x + 4y+ 4z = -11 2y + 5z = -21 2z = - 10
A. (1, 2, -5) B. No solution C. (1, -5, 2) D. (-6, 2, -5)
Mathematics