What is the average of 4, 7, 8, 13, 18, 18, 21?

In a school 2/3 of the students study a language of those who study a language 2/5 study french

Marlow is comparing the prices of two trucks rental compaines company a charges $3 per hour and an addtional $75 as serivce charges company b charges $2 per hour and an additional $85 as serivce charges

What number line represents the solution set for the inequality -1/2 greater than or equal to 4