Please help me with these math problems! I have had so much going on lately and haven't had time to do them Will give lots of points and make brainliest please help

At 6 1/2 cents per pound of string beans how much does 7 pounds cost

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

An airplane travels at an unknown elevation before it descends 3 miles to an elevation of 15 miles. find the elevation of the plane before its descen.