Solve the system by the substitution method.
A. (4, 9), (5, 0)
B. (5, 0)
C. (4, 1), (5, 0)
D. (-4, 9), (-5, 10)
Answer: C
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Solve the problem.Tom Quig traveled 270 mi east of St. Louis. For most of the trip he averaged 70 mph, but for one period of time he was slowed to 20 mph due to a major accident. If the total time of travel was 6 hr, how many miles did he drive at the reduced speed?
A. 80 mi B. 70 mi C. 60 mi D. 55 mi
Factor the perfect square.25x2 + 90x + 81
A. (5x + 9)2 B. (5x - 10)2 C. (5x + 9)(5x - 9) D. (5x - 9)2
Determine the position of the hand relative to the shoulder by considering the robotic arm illustrated in the figure. Round the answer to the nearest tenth.? = 23°, ? = 54° 
A. (14.6, -58.9°) B. (14.6, -31.1°) C. (14.6, 58.9°) D. (14.6, 31.1°)
Multiply and simplify.
A. 
B. 
C. 
D. 