Marion is making trail mix for a group camping trip. she buys 3 pounds of granola for $3 per pound, and 0.75 pounds of raisins for $2 per pound. the equation 3(3) + 0.75(2) = (3 + 0.75)x models the situation, where x is the price per pound of the trail mix. what is the price of the trail mix? $0.36/lb $2.50/lb $2.80/lb $6.75/lb