How do you write 280% as a fraction or mixed numbers?

Let f(x)=2x and g(x)=2x. graph the functions on the same coordinate plane. what are the solutions to the equation f(x)=g(x) ?me asap

Two airplanes start at the same place and travel in opposite directions,one at 395 miles per hour and the other at 422 miles per hour. how many hours will it take for the planes to be 2451 miles apart?

Ab and bc are tangent to circle d. find x is ab = 3x + 8 and bc = 26. find x