What is 34/51 in simplest form

Need on this geometry question. explain how you did it.

1: 4 if the wew 35 surfboards at the beach how many were short boards?

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”?