Use the table to determine if f is one-to-one. If so, use the table for f(x) to find a table for f-1(x).
A. 
B. 
C. 
D. Not a one-to-one function
Answer: D
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Remove parentheses and simplify.8x - (8 - 4x)
A. 8x - 12 B. 12x + 8 C. 12x - 8 D. 4x - 8
Solve.Martha can rake the leaves in her yard in 3 hours. Her younger brother can do the job in 7 hours. How long will it take them to do the job if they work together?
A. 
hr
B. 
hr
C. 
hr
D. 7 hr
Solve problems using a calculator.The number of therms has been established on a customer's gas bill, and the monthly bill is calculated as follows: Item ChargeCustomer charge $0.16326 per dayRegulatory fee $0.05267 per dayGas usage $0.89251 per therm for the first 48 therms $1.07352 per therm for each therm over 48 thermsSuppose that during a 31-day month a customer used 111 therms. What would the customer's total bill be? (Round to the nearest cent, if necessary.)
A. $118.05 B. $117.17 C. $118.94 D. $117.39
Simplify. Include the absolute value symbol if necessary. If the answer is not a real number, state so.
A. 
B. 
C. 
D. 