Find the coordinate of the midpoint of HK if H(-1,2) and if K(-7,-4)

Aplane flies around trip to philadelphia it flies to philadelphia at 220 miles per hour and back home with a tailwind at 280 miles per hour if the total trip takes 6.5 hours how many miles does the plane fly round trip

Describe the domain and range of y=2(3)^x-2+5

Me. i can't figure out this question. give an explanation too. .