Evaluate the expression for the given values.a2 + c2, if a = -4 and c = 5
A. 41
B. 2
C. 9
D. -41
Answer: A
Mathematics
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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. 
= 
B. 
= 
C. 
= 
D. 
= 
Mathematics
Combine like terms.Find the perimeter.
A. 29x - 1 cm B. 22x + 5 cm C. 29x + 5 cm D. 23x + 19 cm
Mathematics
Solve the equation symbolically.-8.28 - 2.2t = 5.8(t + 4.6)
A. -4.37 B. -2.3 C. 2.3 D. 4.37
Mathematics
Divide, when possible.
A. 5 r5 B. 7 C. 5 r4 D. 6
Mathematics