Choose the appropriate response. Perpendicular lines 
.
A. always intersect at a 45° angle
B. have slopes that are negative reciprocals of each other
C. have opposite slopes
D. have the same slope
Answer: B
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If a rock falls near the surface of Earth, it has a constant downward acceleration of 9.8 meters per second per second. If V is the downward velocity, in meters per second, of the rock after t seconds, then V satisfies which equation of change? ?
A. 
B. 
C. 
D. 
Provide an appropriate response.Subtract: 98 - 6.73
A. 97.37 B. 91.27 C. 92.37 D. 3.83
Find all numbers that must be excluded from the domain of the rational expression.
A. x ? -4 B. x ? 0 C. x ? -6 D. x ? 4
Solve.A plane flying with a tailwind flew at a speed of 420 mph, relative to the ground. When flying against the tailwind, it flew at a speed of 300 mph. Express these relationships as equations. Let x represent the speed of the plane in calm air and let y represent the speed of the wind.
A. x + y = 420 y = 300 B. x + y = 300 x - y = 420 C. x + y = 300 y = 420 D. x + y = 420 x - y = 300