Which of the following relations represents a function?

Figure abcd is a parallelogram. if point c lies on the line x = 2, what is the y-value of point c?

Jamie went to home depot.she bought 25 bags of soil that cost $9 per bag.she bought 15 pots at $8 each, and she bought 23 bags of pebbles at $15 each.she used a coupon that gave her $5 off for every 100 dollars she spent. how much did jamie pay at the end?

Your food costs are $5,500. your total food sales are $11,000. what percent of your food sales do the food costs represent?