Perform the indicated operation. Write the answer in the form a + bi.
A. - 
B. 
+ 
i
C. 1 + 
i
D. -1 + 
i
Answer: A
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Use substitution to determine whether the given x-value is a solution of the equation.cos 2x = - 
, x = 
A. Yes B. No
Find the center (h, k) and radius r of the circle. Graph the circle.x2 + 8x + y2 + 6y + 23 = 0
A. (h, k) = (-4, -3); r = 
B. (h, k) = (4, 3); r = 2
C. (h, k) = (-4, -3); r = 2
D. (h, k) = (4, 3); r = 
Solve the problem.You have taken up gardening for relaxation and have decided to fence in your new rectangular shaped masterpiece. The length of the garden is 8 meters and 30 meters of fencing is required to completely enclose it. What is the width of the garden?
A. 14 m B. 7 m C. 3.75 m D. 240 m
Use the graph to find the intervals on which it is increasing, decreasing, or constant.
A. Decreasing on 
and 
; increasing on 
B. Decreasing on 
; increasing on 
C. Increasing on 
and 
; decreasing on 
D. Increasing on (-?, ?)