Evaluate the expression.
?
Fill in the blank(s) with the appropriate word(s).
665,280
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Simplify.7.2 - (-18.6) - (-20.0)
A. 8.6 B. -31.4 C. -45.8 D. 45.8
Write an equation for a function whose graph fits the given description.The graph of f(x) = 
is reflected across the y-axis. This graph is then vertically stretched by a factor of 3.1. Finally, the graph is shifted 2 units downward.
A. f(x) = 3.1
+ 2
B. f(x) = 3.1
- 2
C. f(x) = 2
- 3.1
D. f(x) = -3.1
- 2
Use the given function value and the Fundamental identities, to find the indicated trigonometric function value. tan ? = 
Find cot ?.
A. 
B. 
C. 
D. 
The letters r and ? represent polar coordinates. Write the equation using rectangular coordinates (x, y).r = 2(sin ? - cos ?)
A. 2x2 + 2y2 = y - x B. x2 + y2 = 2y - 2x C. x2 + y2 = 2x - 2y D. 2x2 + 2y2 = x - y