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yanalaym [24]
3 years ago
11

Help me find the perimeter of this square. if you can do it step by step please!

Mathematics
1 answer:
Kruka [31]3 years ago
8 0

Answer:

396

Step-by-step explanation:

It's a square.

That means that all four sides are equal.

So the two expressions you have been given are equal.

2.5x + 76.5 = 12x - 9            Subtract 2.5x from both sides.

<u>-2.5x               -2.5x</u>  

          76.5 = 9.5x - 9          Add 9 to both sides

          <u>  9                 9</u>

          85.5 = 9.5x              Divide by 9.5

       85.5/9.5 = x

x = 9

That is just the value for x. It is not the answer

Side = 12x - 9

Side = 12*9 - 9

Side = 108 - 9

Side = 99

The perimeter = 4 * Side

The perimeter = 4 * 99

Perimeter = 396

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