The table below models the cost of using a high
efficiency washing machine and a standard washing
machine over x number of years
Which equation represents the cost of the high-
efficiency washing machine over a given number of
years
Which equation represents the cost of the standard
washing machine over a given number of years?
Number of
Years
High-
Efficiency
Cost ($)
Standard
Cost($)
After how many years of use would the washing
machines cost the same amount?
Which washing machine would be the more practical
purchase if kept for 9 years?
1
525
430
2
550
460
575
490

First, think of what you know. you know that the number t the end of the equation will need to be subtracted because it is the money he lost from buying the lawn mower. and your first two weeks have negative profit, so that tells you that c and d are wrong. now you can plug any of the weeks into a and b to see which one works. i'll start with plugging week 1 into a.this isn't right because it says your answer for week one should be -90.so now we need to try the same thing with b.this one got you the right answer, (sometimes if you only check with one of the weeks multiple will work so you need to check with more of the weeks, but it worked out fine here)this means that b is the correct answer.let me know if you need more clarification. i hope this : )