I have tried every way to solve these two problems and seem to get stuck every time and keep coming up with the wrong answer.

the answer is (-8,-5)

step-by-step explanation:

the endpoint to midpoint is half the length. the length is (-2,-1) so when you are at the midpoint just add it to it to find your answer -6+(-2)= -8 and -4+(-1)=-5 so (-8,-5)

6 cars because if you have 8 and subtract 2 youll have 6 left over