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 97?
A. 100.02 hr
B. 27.85 hr
C. 13.03 hr
D. 130.30 hr
Answer: C
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Make the required change in the given equation.x2 + y2 + z2 = 9 to spherical coordinates
A. ? = 9 B. ? = 0, ? = 0 C. z = 3 D. ? = 3
Use a calculator to evaluate the expression, or state that the value does not exist. Round the answer to four decimal places when necessary.tanh-1 4
A. 1.0007 B. 0.2554 C. does not exist D. 0.9993
Solve the system to the nearest 0.1 for each variable by using a graphing calculator.x = -2.0y + 3-3y = 4.0x + 2
A. x = -2.8; y = 2.9 B. x = -2.5; y = 2.6 C. x = 2.5; y = -2.6 D. x = -2.6; y = 2.8
Solve the exponential equation. Use a calculator to obtain a decimal approximation, correct to two decimal places, for the solution.3(x - 1) = 15
A. {2.63} B. {6.00} C. {3.46} D. {1.46}