Express the complex number in trigonometric form.
A. 11(sin 20° + i cos 20°)
B. 11(sin 200° + i cos 200°)
C. 11(cos 20° + i sin 20°)
D. 11(cos 200° + i sin 200°)
Answer: D
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Find the measure of the indicated angle in the figure.
A. 99° B. 54° C. 72° D. 144°
Write the equation for the shape described.The circle that is tangent to the x-axis at the point (8, 0) and passes through the point (0, -4)
A. (x - 8)2 + (y + 10)2 = -10 B. (x + 10)2 + (y - 8)2 = 100 C. (x + 8)2 + (y - 10)2 = -10 D. (x - 8)2 + (y + 10)2 = 100
Solve the problem.In one city, the temperature in Fahrenheit on a typical summer day can be approximated by the following function:
Here, t represents the number of hours since 6 a.m. Find the temperature at 
A. 68.4° Fahrenheit B. 102.8° Fahrenheit C. 70.4° Fahrenheit D. 71.6° Fahrenheit
The foci F1 and F2, the vertices V1 and V2, and the endpoints U1 and U2 of the minor axis are as labeled in the figure. Graph the ellipse and find its standard equation. (The coordinates of V1, V2, U1, and U2 are integers, and the coordinates of F1 and F2 are given.)
A. 
+ 
= 1
B. 
- 
= 1
C. 
- 
= 1
D. 
+ 
= 1