A researcher is interested in the effect of music on memory. She randomly divides the students into 3 groups: those who will listen to quiet music, those who will listen to loud music, and those who will not listen to music. After the music is played (or not), she given students a memory test. What is the treatment variable

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:

Determine whether the quadrilateral below is a parallelogram. justify/explain your answer (this means back it up! give specific information that supports your decision. writing just "yes" or "no" will result in no credit.)

Write a story that matches with the expression 42x-5 pls hurry