Find the sum.58.34 + 8.668 + 5.724 + 6.44
A. 79.172
B. 80.172
C. 79.272
D. 79.182
Answer: A
Mathematics
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Complete the identity. 
= ?
A. cos2 x B. sin2 x C. 1 D. -1
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Use the Laws of Exponents to simplify. Write the answer with positive exponents. All variables are nonzero.
A. 3y
B. 
C. 
D. 4x7y
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Find the curl of the vector field.
 FIGURE.png)
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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. 
= Qh - Qc
B. 
= 
C. 
= 
D. 
= - 
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