Perform the indicated operation. Write the answer in scientific notation.
A. 2.64 × 10-1
B. 5.28 × 1015
C. 5.28 × 10-1
D. 2.64 × 1015
Answer: A
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Use a calculator to find the function value. Give your answer rounded to seven decimal places, if necessary.sec 70°28'
A. 2.9898312 B. 2.9908312 C. 5.9816624 D. 5.9826624
Solve the formula for the indicated letter. Assume that all variables represent nonnegative numbers.A = 
?r2 for r
A. r = ±3
B. r = ±
C. r = ±
D. r = ± 
Graph the line containing the given pair of points and find the slope. (-4, -5) (9, -4)
A. - 
B. - 13
C. 13
D. 
Solve. If necessary, round percents to the nearest tenth, dollar amounts to the nearest cent, and all other numbers to the nearest whole.The enrollment at a local college increased 10% over last year's enrollment of 2,100. Find the increase in enrollment.
A. 2,100 students B. 2,310 students C. 210 students D. 1,890 students