Varun put an amount of money in an investment and tracked the value of the investment over three years. At the end of the first year the investment was valued at $1635. At the end of the third year the investment was valued at $1905 A.) assuming this situation is a linear relation, find an equation that represents this investment

20 POINTS PLEASE HELP!

Anut store normally sells cashews for? $4.00 per pound and peanuts for? $1.50 per pound. but at the end of the month the peanuts had not sold? well, so, in order to sell 40 pounds of? peanuts, the manager decided to mix the 40 pounds of peanuts with some cashews and sell the mixture for $2.00 per pound. how many pounds of cashews should be mixed with the peanuts to ensure no change in the? profit?