Find the sum.4.6 + [(-4.5) + (-6.7)]
A. 15.8
B. 2.4
C. 6.8
D. -6.6
Answer: D
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
Solve the system. x + y + z = -2 x - y + 3z = 144x + y + z = -8
A. {(-2, -4, 4)} B. {(4, -4, -2)} C. ? D. {(4, -2, -4)}
Mathematics
Find the GCD or LCM as indicated.Given 208 and 135, find the GCD.
A. 6 B. 1 C. 104 D. 65
Mathematics
Find the values of the variables for which the statement is true, if possible.
= 
A. x = -8; y = -4; z = -5 B. x = 4; y = 5; z = 8 C. x = 8; y = 4; z = 5 D. x = -8; y = 5; z = 4
Mathematics