Jonathan and members of his Spanish Club are going to Costa Rica. He went on vacation with 15 bills totaling %660. He had $20, $50, and $100 bills in his wallet. He has twice as many $20 bills as $50 bills. How much money did he bring in $50 bills?

Apublic library wants to place 4 magazines and 9 books on each display shelf. the expressions 4s +9s represents the total number of items that will be displayed on s shelves. simplify this expression

Solve the system of equations. y= 2x y= x^2 - 15

Yoku is putting on sunscreen. he uses 2\text{ ml}2 ml to cover 50\text{ cm}^250 cm 2 of his skin. he wants to know how many milliliters of sunscreen (c)(c) he needs to cover 325\text{ cm}^2325 cm 2 of his skin. how many milliliters of sunscreen does yoku need to cover 325 \text{ cm}^2325 cm 2 of his skin?