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 11 m wide, find the best location for the light source.
A. 2.4 m down from the top
B. 1.6 m down from the top
C. 0.8 m down from the top
D. 3.4 m down from the top
Answer: C
Mathematics
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Perform the indicated operations.122 + 11 ? 9 - (12 + 5 ? 2)
A. 221 B. 209 C. 241 D. 1373
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Use identities to find the exact value of the expression.sin2 20° + cos2 20°
A. 0.04 B. 0 C. 1 D. 0.20
Mathematics
Solve.Nicole can buy a motorbike for $3139 or a car for $5564. Round each price to the nearest hundred to estimate the difference in the prices of the two vehicles.
A. $2500 B. $2000 C. $2425 D. $2400
Mathematics
Write the fraction and mixed number as a percent.
A. 720% B. 0.72% C. 72% D. 7.2%
Mathematics