I need help on these

12

Step-by-step explanation:

This is a "absolute value"

We use this to make a number or the result of an equation positive.

Example: |2 - 8| = |-6| = 6

You solve the equation first and then turn it positive, if the number is positive, just remains de same.

In your case, it is just a negative number, you just have to turn it positive.

|-12| = 12

It is simple.

1; 35 is the ratio

step-by-step explanation:

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.