Decide whether the expression is or is not an identity.sin (A + 
) = sin A + cos A
A. Not an identity
B. Identity
Answer: A
Mathematics
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Perform the indicated operations.(5x - 6y)(3x - 9y)
A. 15x2 - 63xy + 54y2 B. 15x2 - 18xy + 54y2 C. 15x2 - 63xy - 63y2 D. 15x2 - 45xy + 54y2
Mathematics
Simplify. Be sure to rationalize the denominator. Assume that all variables represent positive real numbers.
A. 
B. 
C. 4x
D. 
Mathematics
Solve the problem.Paint 'n Panel claims that of its 4578 items in inventory, 4146 items are paint, while the rest are non-paint. What percent of total inventory is non-paint? Round to the nearest tenth of a percent.
A. 0.9% B. 9.4% C. 10.6% D. 90.6%
Mathematics
Use the binomial theorem to expand the expression.(5x - 4y)3
A. 125x3 - 300x2y + 240xy2 - 64y3 B. 25x3y - 40x2y2 + 16xy3 C. 25x3y - 20x2y2 + 16xy3 D. 125x3 - 100x2y + 80xy2 - 64y3
Mathematics