Find the product.(x + 7y)(3x - 8y)
A. x2 + 13xy - 56y2
B. x2 + 13xy + 13y2
C. 3x2 + 13xy - 56y2
D. 3x2 + 13xy + 13y2
Answer: C
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Find the limit, if it exists.
A. Does not exist B. 2 C. 0 D. 4
Solve the problem.Use the formula ? = 10 log(I/I0), where the loudness of a sound in decibels is determined by I, the number of Watts/m2 produced by the sound wave, and 
A certain noise measures 44 decibels. If the intensity is multiplied by 100, how many decibels will the new noise measure? (Round to the nearest unit.)
A. 64 decibels B. 46 decibels C. 4400 decibels D. 88 decibels
Use the given vectors to find the indicated expression.v = -3i + 5j - 4k, w = 2i + 4j - 2k, u = -4i - 4j - 3kFind v ? (v × w).
A. -90 B. 0 C. 90 D. 130
Write the function in terms of a function of the reference angle.sin 
A. -sin 
B. sin 
C. sin 
D. -sin 