Answer:
x =10
Step-by-step explanation:
We can use proportions to solve this problem. Take the small triangles side over the large triangle side
8 x+4
------ = ---------
12 2x+1
Solve using cross products
8(2x+1) = 12(x+4)
Distribute
16x+8 = 12x+48
Subtract 12 x
16x-12x+8 = 12x-12x+48
4x+8 = 48
Subtract 8 from each side
4x+8-8 = 48-8
4x= 40
Divide by 4
4x/4 = 40/x
x =10
