I really need help guys

Step-by-step explanation:

First you have to organize your information:

3 Teach.= 70 children

There are 14700 children 210 times 70.

You multiply 3*210 =70*210 because if you multiple one side you have to do the other to.

This equals 630= 14700. They need 630 teachers.

They have 612 so you only have to subtract 630 -612 =18

They need 18 teachers more.

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

b

step-by-step explanation: