F(x)=x+9, g(x)= x2-4x, h(x)= x4+2x3

What is the degree of (f•g•h)(x)?

There were 816 people at a concert when a band started to play. after each song, only half the people stayed to hear the next song. how many people were left at the concert after x songs? write a function to represent this scenario.

Use the elimination method to solve the systems of equations. choose the correct ordered pair. 7x+4y=39

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?