x? = x + 5y, y? = ?x ? 3y
Solve the first-order linear system.
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Solve the problem.Bill kept track of the number of hours he spent exercising each week. The results for four months are shown below. Find the average number of hours Bill spent exercising per week. Round your answer to two decimal places. 
A. 8.70 B. 8.22 C. 7.78 D. 8.45
Decide whether the statement is true or false.All rational numbers are real numbers.
A. True B. False
Rationalize the numerator.
?
?
A. ?
B. ?
C. ?
D. ?
E. ?
Solve the problem.The perimeter of a rectangle is 58 m. If the width were doubled and the length were increased by 5 m, the perimeter would be 78 m. What are the length and width of the rectangle?
A. width 9 m, length 14 m B. width 5 m, length 24 m C. width 14 m, length 14 m D. width 24 m, length 5 m