Solve the problem. Round to two decimal places unless otherwise indicated.In the following formula, y is the minimum number of hours of studying required to attain a test score of x: y = 
. How many hours of study are needed to score 91?
A. 4.60 hr
B. 99.97 hr
C. 46.00 hr
D. 9.63 hr
Answer: A
Mathematics
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Solve the equation for the indicated variable.
= 5 for x
A. b - a + 5 B. 5a + b C. 5a + ab D. a + b + 5
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Find the average rate of change of on the interval [1,5].
a. 1 b. 3 c. 8 d. 12
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Calculate the number of distinguishable strings that can be formed with the stated letters.4 m's and 6 n's
A. 24 B. 670 C. 210 D. 10
Mathematics
Perform the indicated operations and express your answer in the form a + bi. 
A. 10 B. -10 C. -10i D. 10i
Mathematics