Find the exact value of the expression using a sum, difference, or double-angle identity.2 sin 
cos 
A. - 
B. 
C. - 
D. 
Answer: B
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For what values of x does the series converge absolutely?
A. -1 < x ? 1 B. -1 ? x ? 1 C. -1 < x < 1 D. -1 ? x < 1
Solve the problem.In 2012, a certain country recovered 26% of its municipal solid wastes through recycling, up from 17% in 2007. Let P represent the percentage recycled and t the number of years since 2007. Find a linear equation for P as a function of t.
A. P = 1.8t + 24 B. P = 1.8t + 17 C. P = 0.9t - 17 D. P = -1.8t + 7
Find the determinant of the matrix and determine if the matrix is invertible 
?
What will be an ideal response?
Solve the problem.Last year the hatch-back model of a new car cost $18,800. This year's model costs $21,985. How much more does this year's model cost?
A. $3185 B. $39,785 C. $40,785 D. $3085