Simplify.[47 + (-7)] ÷ (-5)
A. 
B. 35
C. -8
D. 8
Answer: C
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Solve the problem.A stone is thrown into a pond. A circular ripple is spreading over the pond in such a way that the radius is increasing at the rate of 2.1 feet per second. Find a function, r(t), for the radius in terms of t. Find a function, A(r), for the area of the ripple in terms of r. 
A. (A ? r)(t) = 4.41?t2 B. (A ? r)(t) = 4.2?t2 C. (A ? r)(t) = 2.1?t2 D. (A ? r)(t) = 4.41?2t
Evaluate the integral.
dt
A. 20
B. 4 ln 5
C. 
- 
D. 5
The magnitude of earthquake 1 is 8.6. Earthquake 2 is half as intense as earthquake 1. What is the magnitude of earthquake 2? Round your answer to 1 decimal place. ?
A. 7.7 B. 8.3 C. 4.3 D. 5.1
250 students in a math class take the final exam. The scores on the exam have an approximately normal distribution with mean ? = 75 and standard deviation ? = 10.Approximately how many students had test scores between 65 and 81.75?
A. 181 B. 147 C. 204 D. 125 E. 85