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ex.) A triangle with a perimeter of 25 has lengths of
2x - 3, x + 4, and x. Use the drawing below if
necessary to label the sides.
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auntion to represent this scenario. Then use

Determine whether the set of whole numbers is closed under addition. explain why the set is or is not closed. give an example.

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:

The parabola x= √y-9 opens: a.)up b.)down c.)right d.)left