28.150=26.5 is the amount you can spend on water. so 26.5/1.29= 20.54 so you can buy 20 bottles of water

The vertex is at (0,-5), therefore the range goes from (-infinity, - 5]
3/10 times 2/3 3 times 2 is 5 and 10 times 3 is 30 5/30 a
You would want to sell the bag of candy in ounces, unless you have way too much candy.