Can someone help me out please

Name each raycalculation tip: in ray "ab", a is the endpoint of the ray.

Iwill give you ! what is the measure of ∠v ?

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”?