Write a quadratic function in standard form whose graph passes through the points (-5.0), (-1,0), and (-4, 3)

Please explain so I can understand

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

When you answer this can you explain

Which statement justifies why angle ebc measures 90?