Im in the 7th grade and whats 1x1 I'm sorry I don't know

5x + 2 = 12 solve the following equation. then place the correct number in the box provided.

Arestaurant chef made 1 1/2 jars of pasta sauce. each serving of pasta requires 1/2 of a jar of sauce. how many servings of pasta will the chef be bale to prepare using the sauce?

I’ve been trying all day to figure this puzzle out. i need the work for it aswell. it is a factoring polynomials tarsia. the image is below.