Evaluate 
at 
.
A. 
B. 
C. 
D. 
E. 
Answer: B
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Answer the question.Illustrate 8 + 0 = 8 with a number-line diagram.
A. 
B. 
C. 
Provide an appropriate response.Given two horizontal lines 
and 
with 
what is the solution set for 
A. [b, a] B. (-?, b] C. (-?, ?) D. Cannot be determined
Give a formula for a piecewise-defined function f for the graph shown.
A.
f(x) = 
B.
f(x) = 
C.
f(x) = 
D.
f(x) = 
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