Frances can complete 91 oil changes in 7 days.
how many oil changes can frances complete in 11 days?

oil changes

What are the sotions to the quadratic equation 9x^2=4

Many newspapers carry a certain puzzle in which the reader must unscramble letters to form words. how many ways can the letters of emdangl be arranged? identify the correct unscrambling, then determine the probability of getting that result by randomly selecting one arrangement of the given letters.

Whats are the trickiest steps to do when adding or subtracting rational expressions? how does knowledge of rational numbers u in adding and subtracting rational expressions?