Gabriel is at the grocery store, and wants to figure out his total cost before he gets to the register. he bought 2.5 pounds of apples that are x dollars a pound and 2 bags of lettuce for y dollars each. gabriel remembers he has a coupon for $2 off his bill. gabriel has $30 to pay for the groceries. what simplified expression would represent the amount of change he should receive? a: 2.5x + 2y + 28 b: 28 – 2.5x – 2y c: 32 + 2.5x + 2y d: 32 – 2.5x – 2y