Answer:
18
Step-by-step explanation:
9*2= 18
18-9=9
because it said twice as old as Robin you multiply
Hope this helped you
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and thank you
(3x+7)(x+1)
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Answer: y = 9
an equation of y=8x-47 will let the line pass through the point (5,-7) and the point (7,9)
i used the desmos graphing calculator website to graph it