Question

Question for 7th grade. Pls give answer as quick as possible... Thank you!!!

A triangle has side length n cm. The second side is 5 less than double this length. The third side is twice the length of the second side. Write an expression for the perimeter of the triangle. Simplify your expression as much as possible.

Answer 1

7n - 15

Explanation:

Let the first side be x

the second side be y

and the third side be z

x = n

y = 2n - 5

z = 2 ( 2n - 5 )

perimeter p = x + y + z

p = n + 2n - 5 + 2( 2n - 5 )

= 3n - 5 + 4n - 10

= 7n - 15

Hope this helps

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