Plz math is my worst subject i have a lot of over due work

Ineed with number 17 i don’t get it at alll

What is the solution to the equation? k/6.4=8.7 2.3 5.568 15.1 55.68

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