Question

The lengths of sides of a triangle are (3x+2), (2x+5), and 4x. Terrel correctly added the lengths of the three sides to find the perimeter. What expression did Terrel write for perimeter?

Answer 1

So permiter=masure of all sides added together
so sides are(3x+2), (2x+5), and (4x)
so (3x+2)+(2x+5)+(4x)
use associative property
a+(b+c)=(a+b)+c so

(3x+2)+(2x+5)+(4x)=3x+2+2x+5+4x
group like terms becasue can move numbers around
(3x+2x+4x)+(2+5)
add like terms
(9x)+(7)
9x+7
he will use 9x+7=perimiter

Answer 2

(3x+2) + (2x+5) + 4x = 5x + 7 + 4x = 9x + 7

Teri wrote the expression 9x + 7 for perimeter.