Question

I do not know this answer

Answer 1

We know that 2+2 is 4.

34 - 4 is 30.

Therefore, the legnth, a, is half of thirty.

30/2 = 15

a = 15

Answer 2

`\bf a= 15\;\; millimetetrs`

Explanation:

perimeter: 34 millimetetrs

perimeter=
`\tt a+2+a+2=34`

`\tt 2a+4=34`

`\tt 2a+4-4=34-4` (Subtract 4 from both sides)

`\tt 2a=30` (Simplify)

`\tt \cfrac{2a}{2}=\cfrac{30}{2}` (Divide both sides by 2)

`\tt a=15`

Therefore, a= 15 millimetetrs.

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