Solve the problem.A coil of wire rotating in a magnetic field induces a voltage given by 
where t is time in seconds. Find the smallest positive time to produce a voltage of 10
.
A. 3? seconds
B. 3 seconds
C. 3.33? seconds
D. 3.33 seconds
Answer: D
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Replace the polar equation with an equivalent Cartesian equation. 8r cos ? + 9r sin ? = 1
A. 8x + 9y = 1
B. 8y + 9x = 1
C. 8x + 9y = x2 + y2
D. 
+ 
= 1
Solve the problem.You are considering renting a car. The rental company, Save-U, charges a $146 base fee plus $26 per week, while another company, Cheap Car, charges a $104 base fee plus $33 per week. After how many weeks does the Save-U rental become the better deal?
A. 4 B. 7 C. 6 D. 5
Solve the problem.A domed ceiling is a parabolic surface. For the best lighting on the floor, a light source is to be placed at the focus of the surface. If 7 m down from the top of the dome the ceiling is 8 m wide, find the best location for the light source.
A. 2.3 m down from the top B. 1.8 m down from the top C. 1.2 m down from the top D. 0.6 m down from the top
Add or subtract. Then simplify by collecting like radical terms, if possible. Assume that no radicands were formed by raising negative numbers to even powers.
- 
A. 7
B. 4
- 3
C. 3 - 4
D. 3
- 4