Solve.Jim can run 5 miles per hour on level ground on a still day. One windy day, he runs 15 miles with the wind, and in the same amount of time runs 7 miles against the wind. What is the rate of the wind?
A. 13
mph
B. 4 mph
C. 5 mph
D. 1
mph
Answer: D
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Compare the right-hand and left-hand derivatives to determine whether or not the function is differentiable at the point whose coordinates are given.
y = 
y = -1
A. Since limx?-1+ f '(x) = -1 while limx?-1- f '(x) = 0, f(x) is not differentiable at 
B. Since limx?-1+ f '(x) = 0 while limx?-1- f '(x) = 1, f(x) is not differentiable at 
C. Since limx?-1+ f '(x) = 0 while limx?-1- f '(x) = -1, f(x) is not differentiable at 
D. Since limx?-1+ f '(x) = 0 while limx?-1- f '(x) = 0, f(x) is differentiable at 
Use the TABLE feature of a graphing utility to find the limit.
A. 0 B. 27 C. 9 D. does not exist
Identify the polynomial as a monomial, binomial, trinomial, or none of these. Give its degree.
r3 + 
r2
A. Binomial, degree 5 B. Binomial, degree 3 C. Binomial, degree 1 D. Trinomial, degree 2
For problems 1-15, perform the indicated operations and simplify.
A. 
B. 
C. 
D. 
E. none of these