Solve the problem.Walt made an extra $9000 last year from a part-time job. He invested part of the money at 6% and the rest at 9%. He made a total of $660 in interest. How much was invested at 9%?
A. $7000
B. $4000
C. $5000
D. $4500
Answer: B
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Solve the problem.An experimental model for a suspension bridge is built. In one section, cable runs from the top of one tower down to the roadway, just touching it there, and up again to the top of a second tower. The towers stand 40 inches apart. At a point between the towers and 10 inches along the road from the base of one tower, the cable is 1 inches above the roadway. Find the height of the towers.
A. 6 in. B. 3.5 in. C. 4.5 in. D. 4 in.
Simplify the radical. Assume that all variables represent nonnegative real numbers. 
A. c6d8
B. 
6
4
C. c6d4
D. c
d
Evaluate the exponential expression.122
A. 4096 B. 169 C. 144 D. 24
Solve the exponential equation. For irrational solutions, round to four decimal places.32x - 1 = 16
A. {0.7619} B. {3.1667} C. {1.7619} D. {1.9659}