Factor the expression completely.A circular pool is surrounded by a concrete walk. The area of the concrete around the pool is 
A. ?(R - r)2
B. ?(R2 - r2)
C. (?R + ?r)(R - r)
D. ?(R + r)(R - r)
Answer: D
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Give an appropriate answer.Let
f(x) = 196. Find
.
A. 3.7417 B. 196 C. 14 D. 10
Solve the equation.- 
s = 
A. - 
B. 
C. 
D. - 
The figure below is a regular hexagon ABCDEF with center O. (P, Q, R, S, T, and U are the midpoints of the sides.)
Which of the following reflections is not a symmetry of the regular hexagon?
A. the reflection with axis the line passing through A and D B. the reflection with axis the line passing through P and Q C. the reflection with axis the line passing through R and S D. the reflection with axis the line passing through A and B E. all of these are symmetries of the regular hexagon.
Solve the problem.How long will it take for prices in the economy to double at a 7% annual inflation rate? Round to the nearest hundredth when necessary.
A. 16.24 yr B. 10.24 yr C. 23.45 yr D. 9.01 yr