Solve the formula for the indicated letter. Assume that all variables represent nonnegative numbers.c2 + d2 + f2 = g2, for c
A. c = -g + d + f
B. c = 
C. c = g2 - d2 - f2
D. c = g - d - f
Answer: B
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Solve the problem.Persons taking a 30-hour review course to prepare for a standardized exam average a score of 620 on that exam. Persons taking a 70-hour review course average a score of 786. Find a linear equation which fits this data, and use this equation to predict an average score for persons taking a 41-hour review course. Round your answer to the tenths place.
A. 669.9 B. 679.7 C. 665.7 D. 658.4
Perform the addition and simplify.
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A. ?
B. ?
C. ?
D. ?
E. ?
Evaluate by using polar coordinates.
A. 
B. 
C. 
D. 
Solve the problem.A heat engine is a device that converts thermal energy into other forms. The thermal efficiency, e, of a heat engine is defined by 
where Qh is the heat absorbed in one cycle and Qc, the heat released into a reservoir in one cycle, is a constant. Find 
.
A. 
= 
B. 
= Qh - Qc
C. 
= - 
D. 
= 