Solve the equation.x2 - 81 = 80x
A. {-1, 81}
B. {-9}
C. {-9, 9}
D. {-81, 1}
Answer: A
Mathematics
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Rationalize the denominator.
A. 1
B. 5
C. 
D. 5
Mathematics
Use a product-to-sum identity to rewrite the expression.cos 12° sin 42°
A. 0.5(sin(54°) + sin (30°)) B. 0.5(cos(54°) - cos (30°)) C. 0.5(cos(54°) + cos (30°)) D. 0.5(sin(54°) - sin (30°))
Mathematics
Evaluate.34
A. 12 B. 3 C. 34 D. 81
Mathematics
Factor the polynomial completely.9k2 - 48kp + 64p2 - 1
A. (3k - 8p - 1)2 B. (3k - 8p + 1)(3k - 8p - 1) C. (3k + 8p + 1)(3k - 8p - 1) D. (3k + 8p + 1)(3k + 8p - 1)
Mathematics