Question

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Answer 1

Perimeter is the outside dimensions.

There are two sides 5z and two sides 4z +3.

5z +5z +4z+3 + 4z +3 = 186

Combine like terms:

18z + 6 = 186

Subtract 6 from both sides:

18z = 180

Divide both sides by 18:

z = 180 / 18

z = 10