The ratio of girls to boys in a math class is 3: 5
a: if there are 15 boys in the classroom, how many girls?
b: if there are 15 girls in the classroom how many students are there in total?

If there are 12 moths and some have 31 days and others have 30 days how many have 28 days?

Find the measure of the interior angles of the following regular polygons: a triangle, a quadrilateral, a pentagon, an octagon, a decagon, a 30-gon, a 50-gon, and a 100-gon.

Fanny mendelssohn manages all the magazines and paperback books at a local grocery store. she prices many paperbacks to sell at $7.99. the cost to the store is $5.29. what is the markup rate on a paperback book, based on its cost?