Solve the system by the addition method. If there is no solution or an infinite number of solutions, so state. Use set notation to express the solution set.
A. 
B. {(7, -4)}
C. {(9, 3)}
D. no solution; ?
Answer: D
Mathematics
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Solve the problem.A painter can finish painting a house in 5 hours. Her assistant takes 7 hours to finish the same job. How long would it take for them to complete the job if they were working together?
A. 6 hours
B. 4 hours
C. 
hour
D. 2
hours
Mathematics
Provide the requested response.Choose the correct viewing rectangle to match the settings: 
by 
A. 
B. 
C. 
D. 
Mathematics
Simplify the expression involving rational exponents.12961/4
A. 6 B. 144 C. 24 D. 7776
Mathematics
Use the change of base formula to find the value of the following logarithm. Do not round logarithms in the change of base formula. Write the answer rounded to the nearest ten-thousandth.log 8 0.069
A. -1.2858 B. -0.7778 C. -9.2892 D. 0.0623
Mathematics