Arate is when one unit of measure changes in terms of another. when you see the word "per" you know that you are dealing with rates. the first unit of measure listed is the dependent variable. the second unit of measure is the independent variable. at times, these quantities are graphed on a coordinate grid. for each of the following rate examples say which unit will be on the x-axis and which unit will be on the y-axis. a. gallons per minute b. assignments per week c. calories per serving html editor keyboard shortcuts

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 : )