PAST DUE HOMEWORK! NEED HELP QUICK!!

Iam a rectangle. my perimeter is 60 feet. how much are do i cover?

Twelve less than a number is at most 20

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”?