Please help solve this

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

What happens to the area as the sliders are adjusted? what do you think the formula for the area of a triangle is divided by 2?

You are shooting hoops after school and make 152 out of a total of 200. what percent of shots did you make? what percent did you miss? show proportion(s).