Solve for a sqrt(a - b + c) = 3

Solve the equation using the given values: x= -2.5; y= -7.51. 2xy + 2x²

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

Ined this is due tomorrow and i dont know the answer can you find all the exponents