Use the substitution method or the elimination method to solve the system. If the system has infinitely many solutions, express the ordered pair in terms of x or y. 5x - 7y = 9-20x + 28y = -27
A. no solution
B. 
C. (5, 9)
D. (4, 3)
Answer: A
Mathematics
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Evaluate the function for the given value.f(x) = 
x; f(-2)
A. -12
B. 36
C. 
D. - 
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Use the power rule and the power of a product or quotient rule to simplify the expression.(2a)5
A. 32a B. 10a5 C. 10a D. 32a5
Mathematics
Solve the inequality.
? 0
A. [-10, 1) or [8, ?) B. [-10, 1) or (1, 8] C. (-?, -10] or (1, 8] D. (-?, -10] or [8, ?)
Mathematics
Use a calculator to approximate to three decimal places.
A. 0.016 B. 1.600 C. 0.16 D. 0.002
Mathematics