The amount of time it takes to water pump to empty a tank very strictly has the capacity of the tank if it takes a water pump 2.5 hours to empty a tape containing 60,000 gallons of water and how long does it take the pump to empty 18 containing 108,000 gallons of water

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 : )

Idont know sorry i have noting like this

You need to do x2-x1,y2-y1 and divide it by 2 and you should get (1,-3) 

This is spanish not math