Rewrite the following as a rational exponent in simplest form

The sum of two numbers is 12 and their difference is 18 what are the two numbers

Afrequency table of grades has five classes (a, b, c, d, f) with frequencies of 3, 13, 14, 5, and 3 respectively. using percentages, what are the relative frequencies of the five classes?

The sum of these consecutive integers is equal to 9 less than 4 times the least of the integer. find the three integers