Find an equation for the ellipse described.Focus at (0, -5); vertices at (0, ±7)
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1
Answer: A
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Solve the problem.Find the area A and circumference C of a circle of diameter 18 in.. Use 3.14 for ?. Round the result to the nearest tenth.
A. A = 1017.4 in.2; C = 28.3 in. B. A = 113 in.2; C = 28.3 in. C. A = 254.3 in.2; C = 56.5 in. D. A = 56.5 in.2; C = 56.5 in.
Approximate the area of the circle using 3.14 for ?.
A. 100.48 ft.2 B. 51.21 ft.2 C. 200.96 ft.2 D. 50.24 ft.2
List the elements in the sample space of the experiment.A box contains 10 red cards numbered 1 through 10. List the sample space of picking one card from the box.
A. None of these B. {10} C. {1, 2, 3, 4, 5, 6, 7, 8, 9, 10} D. {100}
In electrical circuits, the impedance Z (or opposition to the flow of electricity), voltage V, and current I can all be represented by complex numbers. They are related by the equation Z = 
. Use this equation to find the value of the missing variable.V = 76 - 32i, I = 8 + 4i
A. Z = 
- 17i
B. Z = 6 - 7i
C. Z = 6 + 7i
D. Z = 
+ 17i