Solve the system of equations by the substitution method.9x - 7y = 915x + 2y = 27
A. {(7, -3)}
B. {(6, -3)}
C. {(7, -4)}
D. ?
Answer: C
Mathematics
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At the outside wall the roof is 10 feet high. The slope of the roof is 1.03 feet per foot. If the roof is extended beyond the outside wall, what is the height of the roof 3 horizontal feet from the outside wall toward the exterior of the room? ?
A. 13.82 feet B. 6.91 feet C. 7.84 feet D. 13.09 feet
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Simplify.5(-4) + (-10)(-2)
A. 40 B. -40 C. 20 D. 0
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You are given a table showing input and output values for a given function y1 = f(x). Use the table to answer the question.What is the y-intercept of the graph of y = f(x)?
A. 1 B. 5 C. 0 D. -3
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Use an identity to write the expression as a single trigonometric function or as a single number.± 
A. cos 76? B. sin 19? C. cos 19? D. sin 76?
Mathematics