Um I am very much stuck Am I doing this right so far? What else am I missing/need to put?

Problem:
A high school softball diamond is a square. The
distance from base to base is 30ft. To the nearest foot,
how far does the catcher throw the ball from home plate
to second base?

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”?