See attached below.
explain.

I think that x=3.

Please note: I am probably wrong.

Step-by-step explanation:

1. 20 - 14 = 6.

2. 6/2 = 3

3. This means that the model on the bottom is equal to 23.

Hope I helped! :)

180

step-by-step explanation:

5x+40

5(x + 8)

7x - 49

7(x - 7)

18x + 9

9(2x + 1)

15x - 10

5(3x - 2)

step-by-step explanation:

for number one all you have to do is factor 5 out of 5x + 40

for number 2 factor 7 out of 7x - 49

for number three factor 9 out of 18x + 9

for number four factor 5 out of 15x - 10