Combine like terms to create an equivalent expressions

Four congruent circular holes with a diameter of 2 in. were punches out of a piece of paper. what is the area of the paper that is left ? use 3.14 for pi

: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?

Which of these numbers of simulations of an event would be most likely to produce results that are closest to those predicted by probability theory? 15, 20, 5, 10