Use the range rule of thumb to approximate the standard deviation.The heights in feet of people who work in an office are as follows. Round results to the nearest tenth.5.9 5.7 5.5 5.4 5.6 5.9 5.8 6.2 6.0 5.9
A. 0.1
B. 1.2
C. 0.5
D. 0.2
Answer: D
Mathematics
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Simplify the algebraic expression.-6b + 4b
A. cannot be simplified B. -2b2 C. 2b D. -2b
Mathematics
Solve the problem.Find the nth term of the following geometric sequence:9, 9
, 18, 18
, . . .
A. 9(
)n-1
B. 9(
)n
C. 9 ? 2n
D. 9(2)n-1
Mathematics
Write a general formula to describe the variation.A varies directly with t2; A = 320 when t = 8
A. A = 5t2
B. A = 
C. A = 40t2
D. A = 
Mathematics
Solve the problem.In the following formula, y is the minimum number of hours of studying required to attain a test score of x: 
How many hours of study are needed to score 87? Round to the nearest hundredth of an hour.
A. 6.03 hr B. 26.40 hr C. 2.64 hr D. 101.02 hr
Mathematics