A printer costs $28 to manufacture and is sold for $56, what is the percentage markup

Amarathon runner jogging at a constant speed for 45 minutes is it proportional to time or not

Polynomial that can be factored as (3x-4)(3x+4)

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?