?9 mA radio telescope has a parabolic surface. If it is 9 m deep and 12 m wide, how far is the focus from the vertex?
A. 4 m
B. 9 m
C. 3 m
D. 1 m
Answer: D
Mathematics
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Find z1z2. Write the answer in polar form with the argument between 0° and 360°.z1 = 2 + 2i, z2 = 
- i
A. 4
(cos 345° + i sin 345°)
B. 4(cos 345° + i sin 345°)
C. 4
(cos 15° + i sin 15°)
D. 4(cos 15° + i sin 15°)
Mathematics
Find the inverse of the function.f(x) = 
A. f-1(x) = 
for x ? 0
B. f-1(x) = 
C. f-1(x) = 
for x ? 0
D. f-1(x) = 
- 8 for x ? 0
Mathematics
Solve the problem.The amount of money, in dollars, raised each year by a band booster club can be estimated by the function f(x) = 219x - 431,280, where x is the year with 1990 ? x ? 2000. What is the slope of the graph of f?
A. 219 B. -431,280 C. -219 D. 4530
Mathematics
Rationalize the denominator and simplify.
A. 
B. 
C. 
D. 
Mathematics