100 POINT AND BRINIEST! DONT ANSWER IF YOU DONT KNOW THAT ANSWER! Describe and correct the error.

Solve: x^3 + 20x = -2x^3 - 7x
3x^3 = 27x = 0
3x( x^2 + 9 ) = 0
3x ( x - 3)(x + 3) = 0
x = { -3, 0, 3}

The rumpart family is building a new room onto their house. the width of the new room will be 16 feet. the length of the room will be 4% greater than the width. write an expression to find the length of the new room. what will be the area of this new room?

Find the solution of each of the following.

Suppose you just purchased a digital music player and have put 8 tracks on it. after listening to them you decide that you like 4 of the songs. with the random feature on your player, each of the 8 songs is played once in random order. find the probability that among the first two songs played (a) you like both of them. would this be unusual? (b) you like neither of them. (c) you like exactly one of them. (d) redo () if a song can be replayed before all 8 songs are played.