ANSWER THESE QUESTIONS FOR 70 POINTS I NEED THESE PLEASE

Note: I don't know how to do the first 2 questions but the 3rd question I know. PLEASE FIRST LOOK AT THE EXPLANATION. WE ARE NOT HERE TO GIVE OUT ANSWERS, BUT TO HELP YOU.

Step-by-step explanation:

Step 1. IGNORE THE X

Step 2. add 12 and 8 (equals 20)

Step 3. Subtract 3 from 20 (equals 17).

Step 4. Now add the x to 17

Solution: 17x

Your welcome :)

relating to or denoting a system of numbers and arithmetic based on the number ten, tenth parts, and powers of ten.

it alot will look like this 4.4