The Brittle Bird Store prepares bird-seed mixtures by mixing sunflower seeds and millet and packaging them as 5-pound bags for sale. If sunflower seed (s) is regularly sold for $1.75 per pound, and millet (m) is sold for $2.50 per pound, what system of equations could be used to calculate how many pounds of sunflower seed is added to the mixture if the store sells the mixture for $15? Answers {s+m=15 1.75(s+2.5m)=5 s+m=15 1.75s+2.5m=5 s+m=5 1.75s+2.5m=15 4.25(s+m)=15 s+m=5