Question

Please help!! #13 the picture is my problem! Pre- Algebra (math) (10 points!)

Answer 1

2x + 5x + 4 = 25
7x + 4 = 25
7x = 25 - 4
7x = 21
x = 21/7
x = 3 <==

Answer 2

Well you know that the rope as a whole is 25 ft long, so just make each piece equal that:

2x + 5x + 4 = 25
*Minus 4 to both sides to get the "x" values alone*
2x + 5x = 25 - 4
7x = 21
*Divide by 7 on both sides to get "x" alone*
x = 21/7
x = 3

Hope that helps! :)