Question 4 is the one I need

Which number line correctly shows 0.8 + 0.3?

I’m really confused and need your assist me with this question i’ve never been taught

Astudent draws two parabolas both parabolas cross the x axis at (-4,0) and (6,0) the y intercept of the first parabolas is (0,-12). the y intercept of the second parabola is (0,-24) what is the positive difference between the a values for the two functions that describe the parabolas