Can someone please help me answer and understand this question.

it's 4.25 because you add everything together
1.convert .5 to eighths 1/2 to 4/8
2. add all the top numbers 7 + 7 +4 =18
3. 18/8 = 2 2/8 + 1 + 1 = 4 2/8 or 4.25
if you still don't get it then message me and i'll try to explain it better