Raisins sell for $3.50 per pound, and granola sells for $5.90 per pound. terri bought some raisins and some granola. the total weight was 2.1 pounds and cost $8.79. let r represent the number of pounds of raisins terri purchased. which expression represents the number of pounds of granola she purchased? a. 2.1 – r b. 2.1r c. r + 2.1 d. r – 2.1