Ned got an overall grade of 86 percent because if each question is 4 points, then 6×4=24 but if he got a bonus 10 points, then you can do 24-10=14 and then you do 100-14 which equals your answer: 86.
For answer #3... just replace (T) with 76.50 in the equation T=9h Then since this is a division problem you would do 76.50/9=9h/9 This gives you your answer which is h=8.5. Hope this helps!!:)
