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nekit [7.7K]
3 years ago
12

the perimeter of a rectangle is 54 meters. one side is 3 meters less than four times the length of the other side.

Mathematics
1 answer:
Firdavs [7]3 years ago
3 0
54 = 2(4x-3) + 2(x)
54 = 8x-6 + 2x
60 = 10x
6 = x
so two sides are 6 meters, and the other 2 sides are 21 meters
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In a collection of nickels, dimes, and quarters worth $6.90, the ratio of the number of nickels to dimes is 3:8. The ratio of th
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N=number of nickels
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q=number of quarters

example
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slightly confusing but go with it, it migh make sense or it might not


n:d=3:8
8n=3d

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solve for one of them
solve for nickels in first and quarters in second

8n=3d, n=(3/8)d
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5n+10d+25q=690
divide by 5 to make it easeir
n+2d+4q=138
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(3/8)d+2d+5(5/4)d=138
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