2m - m - 7m simplified is

-6m

Step-by-step explanation:

You can change the "m" in the equation to 1m so if I re-write the problem with this new information it is as follows, 2m-1m-7m So first we take a look at the first portion of the equation and that is, 2m-1m. Which is pretty much a no-brainer, we get 1m or just m. Then we take a look at the second portion of the equation which again, is as follows, 1m(or m)-7m. 1-7=-6 so if the answer with no variable is -6 then just add your variable on the end and get a final answer of...-6M

I hope this answer was not confusing and could help you out a bit. If you would be so kind, please mark this answer brainliest.  

you never say the total so we cant find the percentage used for petrol

step-by-step explanation:

i would need to see the dot plot : )