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. At least how many hours of study are needed to score 89 on the test? Round to the nearest hundredth when necessary.

A. 36.4 hr
B. 7.16 hr
C. 3.64 hr
D. 100.97 hr


Answer: C

Mathematics

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