Use Descartes' Rule of Signs to determine the possible number of positive and negative zeros of f(x) = x5 + 2x.
A. 1 positive real; 3 negative reals or 1 negative real
B. no positive reals; no negative reals
C. 1 positive real; 5 negative reals or 3 negative reals or 1 negative real
D. 5 positive reals or 3 positive reals or 1 positive real; no negative reals
E. 3 positive reals or 1 positive real; 3 negative reals or 1 negative real
Answer: B
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Solve the system by the addition method. If there is no solution or an infinite number of solutions, so state. Use set notation to express the solution set.
A. {(2, -2)}
B. {(-2, 2)}
C. no solution; ?
D. infinitely many solutions; 
or 
Solve the problem.Tom Quig traveled 250 mi east of St. Louis. For most of the trip he averaged 70 mph, but for one period of time he was slowed to 10 mph due to a major accident. If the total time of travel was 7 hr, how many miles did he drive at the reduced speed?
A. 60 mi B. 50 mi C. 40 mi D. 35 mi
Find the indicated directed path.Find a directed path from "E to C". 
A. "EBC" B. "EABC" C. "No route exists." D. "EC"
Simplify using rational exponents.
A. 3a5b2
B. 3a4b2
C. 3a4b6
D. 3a4b3