What is markup in math ?

How much a retailer increases the price over what they paid for it (which is how they make money to pay for all their costs and hopefully make a profit). Shown as an amount, or as a percentage of the price the retailer paid.

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)