If x=-2 is a zero of the polynomial x 2 − 8kx + 9 then find the k value?

If 20% of a number is 35, what is 50% of that number?

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

If you could answer these your a life saver