Ralph is planning to use the same indoor rock climbing facility that his friend Trina did. Trina can't remember how long she climbed, but she spent a total of \$21. on her session. She paid a $ entrance fee and $3.25 for every hour she climbed. If Ralph wants to spend the same amount of money, write an equation to help him figure out how long he should plan on climbing?

Kayla and alberto are selling fruit for a school fundraiser. customers can buy small boxes of grapefruit and large boxes of grapefruit. kayla sold 3 small boxes of grapefruit and 1 large box of grapefruit for a total of $65. alberto sold 1 small box of grapefruit and 1 large box of grapefruit for a total of $55. what is the cost each of one small box of grapefruit and one large box of grapefruit?