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Elina [12.6K]
3 years ago
13

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

Mathematics
1 answer:
Jlenok [28]3 years ago
7 0
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\\\\
-y+7=-4\ \ \ | subtract\ 7\\\\
-y=-11\ \ \ | multiply\ by\ -1\\\\
y=11\\\\
x=11+7=18\\\\
Now\ Karen\ is\ 18\ years\ old \ and\ Suzanne\ is\ 11\ years\ old.

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Answer:

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Step-by-step explanation:

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multiply your answer by 100 to get a percentage: 0.6780 x 100= 67.8%

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3 years ago
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2 years ago
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castortr0y [4]
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7 0
3 years ago
Sandra uses her office fax machine to send fax at the rate of $0.10 per page. She decides to rent a fax machine for $80 a year.
Maksim231197 [3]
Part A: 
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 x: the number of pages that Sandra should fax
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 0.06x <= 80
 Note that the price will be less than using the fax from the office, since for the same number of pages, we have:
 y = 0.10x
 Answer:
 
an inequality that can be used to calculate the number of pages that Sandra should fax in a year is:
 
0.06x <= 80

 Part B:
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 Sandra can use the leased fax for 1333 pages and the cost will be:
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  Answer:
 
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8 0
3 years ago
My friend sent me this to work on, but I’m confused on how to do it :(
marin [14]

Answer:

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Step-by-step explanation:

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8 0
2 years ago
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