Mark used a number line to model dividing 2 3 by 3. he divided the number line from 0 to 1 in 3 equal sections, and then divided each of those sections into 2 equal parts. mark says 2 3 ÷ 3 is 1 3 . is his answer correct?

A80-foot piece of siding is cut into three pieces so that the second piece is four times four times as long as the first piece and the third piece is five times as long as the first piece. if x represents the length of the first piece, find the lengths of all three pieces.

45% of the trees in a park are apple trees. there are 27 apple trees in the park. how many trees are in the park in all?

About 9% of th population is hopelessly romantic. if 2 people are randomly selected from the population, what is the probability that at least 1 person is hopelessly romantic?