Fred has two pens ( red and green). he wants to write the word "yes" and "no" with both pens. in how many ways can he write both words with both pens?

The ratio of the measures of the three angles in a triangle is 2: 9: 4. find the measures of the angels

The height of a plant, in inches, p years after planting it is given by the polynomial function r(p) = -2p% + 270p. find the height of the plant when p = 90 years.

The students in a class were asked how many siblings they have. the data obtained is represented in the dot plot. the number of students who have no siblings is . the number of students who have three or more siblings is .