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3 years ago

9

The product of 8, and a number increased by 7. is 104. What is the number?

1 answer:

Lynna [10]3 years ago

4 0

Answer:
12.125
Step-by-step
8x+7=104
-7 -7
8x=97
/8 /8
x=12.125

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2 years ago

Karen is seven years older than suzanne.Four years ago,karen was twice as old as suzanne was.How are they now?

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$x-\ Karen's\ age\\\\
y-\ Suzanne's\ age\\\\
 \left \{ {{x=y+7} \atop {x-4=2(y-4)}} \right.\\\\ \left \{ {{x=y+7} \atop {x-4=2y-8}} \right.\\\\ \left \{ {{x=y+7} \atop {x=2y-4}} \right.\\\\y+7=2y-4\ \ \ | subtract\ 2y\\\\
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-y=-11\ \ \ | multiply\ by\ -1\\\\
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x=11+7=18\\\\
Now\ Karen\ is\ 18\ years\ old \ and\ Suzanne\ is\ 11\ years\ old.
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