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 9 m down from the top of the dome the ceiling is 19 m wide, find the best location for the light source. Round to one decimal place if necessary.
A. 5 m down from the top
B. 2.5 m down from the top
C. 10 m down from the top
D. 7.5 m down from the top
Answer: B
Mathematics
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Solve the problem.A kitchen table costs $220. The tax is $19.80. What is the tax rate?
A. 11% B. 10% C. 9% D. 0.9%
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? is an acute angle and sin ? and cos ? are given. Use identities to find the indicated value.Given that sin ? = 
and cos ? = 
, find the value of tan ?.
A. 
B. 
C. 
D. 
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Simplify. Assume all variables represent positive real numbers.
A. 
B. 
C. 
D. 
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Solve the problem.In the "Big Bucks" lottery game, a person is to pick 7 digits from 0 to 9 in correct order. If a number can be repeated, how many ways are there to play a pick?
A. 40,353,607 B. 100,000,000 C. 282,475,249 D. 10,000,000
Mathematics