Which description is represented by a discrete graph?
a.) kiley bought a platter for $19 and several matching bowls that were $8 each. what is the total cost before tax?
b.) the temperature at 9
a. m. was 83•f and is heating up at an average rate of 6•f per hour. what is the temperature x hours later?
c.) juan ate an egg with 78 calories and some cereal with 110 calories per serving for breakfast. what is the total amount of calories he consumed?
d.) a bottle contained 2,000 ml of liquid and is being poured at an average rate of 300 ml per second. how much liquid is left in the bottle after x seconds?

The answer is A: Kiley bought a platter for $19 and several matching bowls that were $8 each. What is the total cost before tax?  Just took the test.

the revenue of the fitness center, y, is the product of two factors: the number of members and the fee paid by each member. there are 320 members now, but number of members goes down by 10 for each $5 increase in fees, so if x is the number of $5 price increases then members is equal to (320 - 10x). since the fee is currently $45, and the fee increases by $5 for every price bump x, the fee is given by (45 + 5x). so, revenue y is given by y = (320 - 10x)(45 + 5x).