Find all the numbers for which the rational expression is defined.
A. x ? 0
B. x ? 4 and x ? -2
C. x ? 9 and x ? -9
D. x ? -4 and x ? 2
Answer: B
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Divide. Simplify, if necessary.- 
÷ 
A. - 
B. - 
C. 
D. - 
The body surface area B of an 80-kilogram man depends on his height h measured in meters. The value of the power in this function is 
. If the body surface area is multiplied by 1.03, how is the height affected? Round your answer to two decimal places if necessary.
?
A. Height is multiplied by 1.01. B. Height is multiplied by 1.5. C. Height is multiplied by 1.23. D. Height is multiplied by 1.06.
Use the rules for exponents to rewrite the expression and then evaluate the new expression. 
A. 
B. -4
C. 2
D. - 
Solve.Jeff takes 5 hours longer to build a fence than it takes Bill. When they work together, it takes them 6 hours. How long would it take Bill to do the job alone?
A. 12 hr B. 11 hr C. 9 hr D. 10 hr