If three geometric means are inserted between 1 and 81, find the second geometric mean

Find the average rate of change for f(x) = x2 − 3x − 10 from x = −5 to x = 10.

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”?

How do i take any fraction and make it into a decimal or percentage?