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Which equation represents a proportional relationship that has a constant of proportionality equal to 1/5

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

Which expression do you get when you eliminate the negative exponents of 4a^2 b^216a^-3 b