Solve the problem.Junior high classes of 30 students each met in the cafeteria to take achievement tests. If exactly 6 students sat at each table and 30 tables were used, how many classes took the tests?
A. 8 classes
B. 6 classes
C. 19 classes
D. 9 classes
Answer: B
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Use scientific notation to solve the problem.The distance from the earth to the sun is 92,900,000 miles. How long would it take a rocket, traveling at 2.9 x 103 miles per hour, to reach the sun?
A. 3.2 x 104 hr B. 3.2 hr C. 3.2 x 102 hr D. 3.2 x 103 hr
Find f-1(x) for the following one-to-one function f.f(x) = 
A. f-1(x) = 
B. f-1(x) = 
C. f-1(x) = 
D. f-1(x) = 
Solve the problem.In a Psychology class, the students were tested at the end of the course on a final exam. Then they were retested with an equivalent test at subsequent time intervals. Their average scores after t months are given in the table.
Using a graphing utility, fit a logarithmic function y = a + b ln x to the data. Using the function you found, estimate how long will it take for the test scores to fall below 84%. Express your answer to the nearest month.
A. 8 months B. 12 months C. 20 months D. 10 months
Graph the function.f(x) = 
A. 
B. 
C. 
D. 