Solve the problem.In the following formula, f(x) 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 85?
A. 2.63 hr
B. 5.18 hr
C. 100.93 hr
D. 26.30 hr
Answer: A
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Find the extreme values of the function subject to the given constraint.
A. Maximum: 6 at 
minimum: 3 at 
B. Maximum: 6 at 
minimum: -3 at 
C. Maximum: 11 at (6, 3, 2), (6, 2, 3), (3, 2, 6), (3, 6, 2), (2, 3, 6), (2, 6, 3); minimum: 1 at 
D. Maximum: 9 at 
minimum: 3 at 
Solve the problem.Use a tree to show the parent-child relationships in the following family. Elizabeth has three children: Harold, Lauren, and Sybil. Harold has two children: John and Nigel. Lauren has two children: Bret and Gail. Sybil has four children: Susan, Diane, Mark, and Zoe.
A. 
B. 
C. 
D. 
Describe the inverse of the statement.Multiply x by -9 and subtract 3.
A. Multiply x by - 
and subtract -3.
B. Add 3 to x and divide the result by -9.
C. Divide x by -9 and add 3.
D. Subtract 3 from x and multiply the result by -9.
Find the exact value of the following expression without using a calculator.sec (45°)
A. 1
B. 
C. 
D. 