The perimeter of a triangle is the sum of its sides. So, we have

We have an exact value for the perimeter, and variable expressions for the sides. Let's substitute the formula above with what we're given:

If you divide both sides by 12, you have

So, the lengths of the sides are



48 feet
Divide 858 by 18 to get 47.6 > simplify > 48 feet
(2x + 8) (x+2) is what I got
4x+x-2x>4-1-6
5x-2x>4-7
3x>-3
x>-1
(-1, positive infinity]
sadly my phone doesn't have an infinity sign.
it would look like the picture.