Ahigh speed elevator can rise 480 feet in 30 seconds. what expression represents the rate, in feet per minute, of the elevator?

We know that the elevator can rise 480 feet in 30 seconds.  From this, we can figure out how many feet the elevator rises per second.

480 feet / 30 seconds = 16 feet / 1 second

This means that the elevator rises 16 feet in 1 second.
However, the question asks how many feet the elevator can rise per minute, so we have to multiply this amount by 60, because there are 60 seconds in a minute.

16 feet * 60 = 960 feet per minute.

Therefore, the high speed elevator can rise 960 feet in a minute.

3x+9+4x+x=8x+9that's the answer for your question.