Using no tools how would you prove that two lines are parallel

Shania's test scores in 8 subjects were 88, 91, 85, 74, 69, 72, 80, and 87. shania found the middle number of her scores. which type of measure did she find?

You paint a 1/2 of a wall in 1/4 hour. how long will it take you to paint one wall

Li buys supplies so he can make and sell key chains. he begins to make a profit only after he sells 4 key chains. what point on the graph makes the most sense in this situation?