Solve: 2x = 20

I know the answer is 20 but apparently it won't process so there's more to it.

You drop a rubber ball off the roof of a 50 meter high building onto a paved parking lot. it bounces back up with every bounce, but not quite all the way back up to you. after the first bounce it bounces back only 80 percent of the distance it was dropped from. the pattern continues, meaning after every bounce it comes up to just 80 percent of the previous maximum height. so if before the first bounce the height is 50 meters, what height does the ball reach after the fifth bounce? round your answer to one decimal place and chose the correct response from the choices below:

Divide. write in simplest form 41/6 divided by 10

The holiday party will cost $160 if 8 people attend. if there are 40 people who attend the party, how much will the holiday party cost