Help!! For my science class, I need to design a functioning rube Goldberg machine using household items that contains three different types of simple machines. Any ideas? *I know the category says math, but there is no science one*

You will get 25 points an image of a rectangular prism is shown below: part a: a cross section of the prism is cut with a plane parallel to the base. what is the name of the shape created by the cross section? explain your answer. (5 points) part b: if a cross section of the prism is cut perpendicular to the base, what would be the shape of the resulting cross section? explain your answer. (5 points)

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?