Solve by the substitution method. x + 2y = 14-4x + 3y = 21
A. {(0, 7)}
B. {(1, 6)}
C. ?
D. {(-7, 0)}
Answer: A
Mathematics
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Test the vector field F to determine if it is conservative.F = 6x6y4i + 
j - 
k
A. Not conservative B. Conservative
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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. 
= Qh - Qc
D. 
= 
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Find the exact value of the expression or state that it does not exist.csc
A. - 
B. 
C. 
D. - 
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Fill in the blank with one of the words or phrases listed below. 
The 
of two sets is the set of all elements common to both sets.
A. absolute value B. solution C. union D. intersection
Mathematics