At one high school, students can run the 100-yard dash in an average of 15.2 seconds with a standard deviation of 0.9 seconds. The times are very closely approximated by a normal curve. Find the percent of times that are:Between 15.2 and 16.1 seconds
A. 13.5%
B. 34%
C. 68%
D. 50%
Answer: B
Mathematics
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Solve the problem.The radius, r, of a right circular cone can be found using the formula 
where V is the volume and h is the height. If the volume is 290 cubic inches and the height is 19 inches, what is the radius? (Use 
and round to the nearest tenth.)
A. 3.8 in. B. 4.0 in. C. 1.9 in. D. 2.2 in.
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Simplify the expression by using a sum or difference identity.cos 
cos 
+ sin 
sin 
A. 
B. 
C. - 1
D. 
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If n is an integer, n ? 180° represents an integer multiple of 180°, and 
represents an odd integer multiple of 90°. Decide whether the expression is equal to 0, 1, -1, or is undefined. cot(n ? 180°)
A. 1 B. Undefined C. -1 D. 0
Mathematics
Add.
A. 279.508 B. 279.498 C. 279.608 D. 279.598
Mathematics