36 of them did not have an umbrella because out of 11 people, 4 did not bring an umbrella.
Well, 5384 is 5000 bigger than 384. So you would add 20000 (4*5000) to the answer of 4*384, which is 1536.
So 1536+20000=21536
Yes, it does. Because these points do respect the "law" that for each "x" there is only one "y" that corresponds to it
Only this function is lineer.
Because it is arithmetic.