Find a general term, an, for the given terms of the sequence.0, 2, 6, 12, 20, . . .
A. an = 2n-1 - 1
B. an = 2n - 2
C. an = 4n - 6
D. an = n2 - n
Answer: D
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Differentiate the function.r(t) = (cot t)i + (csc t)j
A. r'(t) = (sec2 t)i + (tan t sec t)j B. r'(t) = (-csc2 t)i - (cot t csc t)j C. r'(t) = (-sec2 t)i - (tan t sec t)j D. r'(t) = (csc2 t)i + (cot t csc t)j
Use a right triangle to write the expression as an algebraic expression. Assume that x is positive and in the domain of the given inverse trigonometric function.sin(sec-1 
)
A. 
B. 
C. 
D. x
Find the present value of the annuity. Round to the nearest cent.
Payments of $2600 made annually for 25 years at 8% compounded annually
A. $25,512.76 B. $25,815.40 C. $27,374.78 D. $27,754.43
Express as a sum of logarithms.log8 (13 ? 9)
A. log 13 + log 9 + log 8 B. log (13 + 9 + 8) C. log4 13 + log4 9 D. log8 13 + log8 9