Simplify the expression by using a sum or difference identity.cos(14°) cos (-4°) - sin(14°) sin (-4°)
A. sin 10°
B. sin 18°
C. cos 18°
D. cos 10°
Answer: D
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Find Dxy. e13xy + xy = 5[Hint: Use implicit differentiation]
A. - 
B. - 
C. - 
D. - 
Match the graph with its exponential function.
a. 
b. 
c. 
d. 
Perform the indicated operations.(8x3 + 2x2) - (7x2 - 5x -1) - (6x3 + x - 5)
A. 14x3 - 9x2 + 4x - 6 B. 2x3 - 3x2 - 4x + 6 C. 2x3 - 5x2 + 4x + 6 D. 2x3 + 5x2 + 6x - 6
Provide an appropriate response.When using the unpaid or previous month's balance method:
A. the billing cycle is always 30 or 31 days B. the average daily balance is the same as the unpaid balance C. the first step in calculating the new unpaid balance is to determine the purchases for the period and then add them to the previous balance D. you should first multiply the unpaid or previous month's balance by the monthly rate