Solve the problem.Find the missing length in the following right triangle. If necessary, round to the nearest tenth. 
A. 40 mi
B. 20 mi
C. 6.3 mi
D. 10 mi
Answer: C
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Write in scientific notation.0.000000020305
A. 2.0305 × 10-9 B. 2.0305 × 10-7 C. 2.0305 × 10-8 D. 2.0305 × 108
Use the formula for the general term (the nth term) of a geometric sequence to find the indicated term of the sequence with the given first term, a1, and common ratio, r.Find a5 when a1 = 8, r = -5.
A. 5000 B. -25,000 C. -5000 D. 625
Solve the problem.the size (in thousands) of a certain population in year x is approximated by the function 
(where x = 0 corresponds to the year 1990). predict the size of the population in the year 2007.
A. About 147,040 B. About 216 C. About 216,400 D. About 1,616,096
Solve.The temperature at 5:00 was -7°C. Four hours later, it was -15°C. What was the change in temperature?
A. 8°C B. 22°C C. -22°C D. -8°C