Find the center (h, k) and radius r of the circle. Graph the circle.x2 + y2 - 2x - 2y - 7 = 0
A. Center (1, -1), r = 3
B. Center (1, 1), r = 3
C. Center (-1, -1), r = 3
D. Center (-1, 1), r = 3
Answer: B
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Express the rational number as a decimal.
A. 0.3 B. 0.85 C. 3.2 D. 1.7
Solve the problem.The following graph shows weekend gross revenue for a summer blockbuster film. 
How much more revenue did the film earn the first weekend compared with the third weekend?
A. $175,629,725 B. $150,286,595 C. $87,913,875 D. $62,570,745
Write the expression as a complex number in the form a + bi.3 + 
A. 3 + 10i B. 13 + i C. -7 D. 3 - 10i
When two railroad tracks merge, the overlapping portions of the tracks are in the shapes of circular arcs (see figure). The radius of each arc r (in feet) and the angle ? are related by
?
?
Write a formula for x in terms of cos ?.
?
?
A. ?
B. ?
C. 
?
D.
?
E.
?