Why does the author include the information about balloons? Group of answer choices

to give the readers a comparison that will help them understand how air pressure works

to show why warm air rises and why cool air stays closer to the surface of the Earth

to prove that air that goes up somewhere must always come done somewhere else

to suggest the author's teacher was incorrect when he said "you don't get something for nothing"

In 2012 it was reported that 64% of adult americans watch football regularly. you want to know if this percentage has increased. to do this you randomly sample 400 adults from across the united states. you ask all these adults, "do you regularly watch football? " 268 of the adults respond that they do regularly watch football. carry out at alpha =.05 a hypothesis to test your claim. make sure to check all necessary conditions and state your conclusion in the context of the situation

Sarah and juan were running in the school track meet. the muscles in their arms and legs them run fast. other muscles that you cannot see were also at work. the most important muscles for this track meet were the muscles in their a) arms. b) eye. c) feet. d) heart.

Discussion board 5 - the romantir areanocturne, op. 9 no 2 solo piano - chopin (peatured listening p 778)when you listen to this piece, what does it make you think of and how does it make you feel? what do you think "nocturne" means? is that an appropriate title for this piece? the piano uses rubato throughout - what effect does that have on the performance? do you think the use of rubato enhances the performance, or would you rather hear a steadybeat throughout the piece? after you post your answer, read and respond to the posts of at least two other classmates.