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xxTIMURxx [149]
3 years ago
7

The perimeter of a rectangle is 40 units. One side of the rectangle is 7 and the other is x+2. What's the value of x?

Mathematics
2 answers:
FromTheMoon [43]3 years ago
7 0
Formula for perimeter of rectangle = 2l + 2w

Substitute

40 = 2(7) + 2(x+2)
40 = 14 + 2x + 4
40 = 18 + 2x
22 = 2x
/2     /2
11 = x

Therefore 11 = x

Proof:

x + 2 = ?
11 + 2 = 13

13 + 13 + 7 + 7 = 40
lapo4ka [179]3 years ago
6 0
Try 18 and then multiply the sum of 2 and 18 to 7
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