Since nobody answered my other questions, can someone show me how to solve and answer 14 and 15 all the parts? i need this done right now

Which of the following can be used to explain a statement in a geometric proof?

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”?

Eden has a part time job. she is paid ? 7.20 an hour the week she worked 18 and a half hours how much is she paid