I need number 4 and 5

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

Organic apples are on special for $1.50 per pound. does total cost vary inversely or directly with the number of pounds purchased? find the cost of 3.4 pounds of apples. a. inversely: $5.10 b. directly; $5.10 c. inversely: $2.27 d. directly; $2.27

The length of the line segment ac is 8x-9 what is the value of x