Use a graphing calculator to determine which expression completes the identity.The expression 
is to be the left hand side of an equation that is an identity. Which one of the following four expressions can be used as the right hand side of the equation to complete the identity?
A. csc2x
B. sec2x
C. -cos2x
D. tan2x
Answer: A
Mathematics
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Solve the problem.Suppose that the amount of oil pumped from a well decreases at the continuous rate of 
per year. When, to the nearest year, will the well's output fall to one-eighth of its present value?
A. 2 years B. 17 years C. 26 years D. 39 years
Mathematics
Solve the system.x2 + 2xy + y2 = 9x2 + 2xy - y2 = -9
A. {(0, 3), (0, -3), (6, 3), (6, -3)} B. {(0, 3), (0, -3), (6, 3), (-6, -3)} C. {(0, 3), (0, -3), (-6, 3), (-6, -3)} D. {(0, 3), (0, -3), (-6, 3), (6, -3)}
Mathematics
Use a differential to approximate the quantity.
?
?
Round the result to the nearest thousandth, if necessary.
?
__________
Fill in the blank(s) with the appropriate word(s).
Mathematics
Solve.
= 
A. x = 
B. x = 
C. x = 
D. x = 
Mathematics