Rational function

Question

Time to go shopping! You are considering two refrigerators. They are both Side by Side and 25 cu-ft. Both come with an Energy Guide estimate for the annual cost of electricity.

If you plan on keeping the refrigerator for 20 years, which refrigerator should you buy? If you plan on keeping the refrigerator for 30 years, which refrigerator should you buy? (Hint: Compare the average cost per year of  each refrigerator.)

1. What do you know from the reading the problem?
2. What type of mathematical function is this?
3. What is needed in order to move forward with answering the two questions above?
4. *Try making a KWL chart, a mind-map, or a flow chart

Refrigerator BrandPurchase PriceCost of Electricity per year
Freezadir	$1300	$90
Whirldoo	$1700	$75

Answer 1

After 20 years your total cost for Freezadir is 1300+90*20

After 20 years your total cost for Whirldoo is 1700+75*20

compare the costs, the cheaper you should buy

After 30 years your total cost for Freezadir is 1300+90*30

After 30 years your total cost for Whirldoo is 1700+75*30

compare the costs, the cheaper you should buy