Me im so done mean value theorem to the f(x)=3e^(9x)-4x-9

Solve 3x-18=2y and 5x-6y=14 by elimination or substitution . show all !

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?

X/y + 4y/x divided by x/y - 2y/x explain as in depth as you can how you simplfied the fractions. i don't know where to start on this : /