The table models the cost, why, of using a high efficiency washing machine and a standard washing machine over X number for years. 1. Which equation represents the cost of the high-efficiency washing machine over a given number of years.

y = 25x + 500
y = 25x + 525
y = 50x + 500
y = 50x + 525

2. Which equation represents the cost of the standard washing machine over a given number of years?

y = 25x + 430
y = 30x + 400
y = 60x + 400
y = 60x + 430

3. After how many years of use would the washing machines cost the same amount?

9 years
10 years
19 years
20 years

4. Which washing machine would be the more practical purchase if kept for 9 years?

-high efficiency machine
-standard machine
-costs would be the same

Which expression is not a polynomial?

2people are trying different phones to see which one has the better talk time. chatlong has an average of 18 hours with a standard deviation of 2 hours and talk-a-lot has an average of 20 hours with a standard deviation of 3. the two people who tested their phones both got 20 hours of use on their phones. for the z-scores i got 1 for the chatlong company and 0 for talk-a-lot. what is the percentile for each z-score?

Acaterer knows he will need 60, 50, 80, 40 and 50 dinner napkins on five successive evenings. he can purchase new napkins initially at 25 cents each, after which he can have dirty napkins laundered by a fast one-day laundry service (i. e., dirty napkins given at the end of the day will be ready for use the following day) at 15 cents each, or by a slow two-day service at 8 cents each or both. the caterer wants to know how many napkins he should purchase initially and how many dirty napkins should be laundered by fast and slow service on each of the days in order to minimize his total costs. formulate the caterer’s problem as a linear program as follows (you must state any assumptions you make): a. define all variables clearly. how many are there? b. write out the constraints that must be satisfied, briefly explaining each. (do not simplify.) write out the objective function to be minimized. (do not simplify.)