Find and simplify the difference quotient of f, 
, for the function.f(x) = 
A. 
B. 
C. 0
D. 
Answer: B
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A model railroad engine is 2 inches long. If the scale is 168 feet to 1 foot, how long is the real engine?
A. 31 B. 29 C. 26 D. 34 E. 28
Solve the inequality. Graph the solution set, and state the solution set in interval notation.|x| ? 3
A. (-?, -3] ? [3, ?)
B. (-3, 3)
C. [-3, 3]
D. (-?, 3]
Find the vertices and the foci of the given ellipse.
+ 
= 1
A. V: (-5, 0), (5, 0); F: (-4, 0), (4, 0) B. V: (-5, 0), (5, 0); F: (0, -3), (0, 3) C. V: (0, -5), (0, 5); F: (-3, 0), (3, 0) D. V: (0, -5), (0, 5); F: (0, -4), (0, 4)
Determine whether f is a linear function. If f is linear, give the values for m and b so that f may be expressed as 
.f(x) = 8.7 - 3.8x
A. Linear; m = -3.8, b = 8.7 B. Nonlinear C. Linear; m = 3.8, b = -8.7 D. Linear; m = 8.7, b = -3.8