Ateacher had 21 red pens. if the ratio of red pens to blue pens she owned was 3: 1 how many pens did she have total?

Find the slope of the line passing through a pair of points

If rt is greater than ba, which statement must be true ?

Melanie is buying a bathing suit that costs 39.99. she is given a discount at the cash register of $6.00 when she scratched 15% off on a game piece for a store promotion. what will the sale price of melanie’s bathing suit be?