Solve the problem.Junior high classes of 30 students each met in the cafeteria to take achievement tests. If exactly 5 students sat at each table and 18 tables were used, how many classes took the tests?
A. 6 classes
B. 5 classes
C. 16 classes
D. 3 classes
Answer: D
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Determine the place value of the digit 3 in the whole number.30,542
A. tens B. ten-thousands C. thousands D. hundred-thousands
In a school survey, students showed these preferences for instructional materials. Answer the question.
About how many students would you expect to prefer radio in a school of 850 students?
A. About 306 students B. About 153 students C. About 43 students D. About 5 students
Use properties of logarithms to expand the logarithmic expression as much as possible. Where possible, evaluate logarithmic expressions without using a calculator.ln 
A. ln e3 + ln 5 B. ln e3 - ln 5 C. 3 - ln 5 D. 3 + ln 5
Find all critical numbers for the function. State whether it leads to a local maximum, a local minimum, or neither.f(x) = -x3- 4.5x2 + 12x + 4
A. Local maximum at -4; local minimum at 1 B. Local maximum at -1; local minimum at 4 C. Local maximum at 1; local minimum at -4 D. Local maximum at 4; local minimum at -1