Can someone please teach me how to do percents? i have a math test on tuesday and they just dont make any sense to me? (Increase and decrease)

Order the measurements from the least to the greatest. 2,720 ml , 24.91 l , 0.0268 kl

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”?

What is the inverse of f(x) = 6x -24