I just want to know if this is correct if not Plss correct me (ZOOM IN TO SEE FULL PIC)

The interior angles formed by the side of a hexagon have measures of them up to 720° what is the measure of angle a

Scores on a university exam are normally distributed with a mean of 78 and a standard deviation of 8. the professor teaching the class declares that a score of 70 or higher is required for a grade of at least “c.” using the 68-95-99.7 rule, what percentage of students failed to earn a grade of at least “c”?

If on=8x-8,lm=7x+4,nm=x-5,and ol=3y-6