staples sell 15 boxes of pens for every 4 boxes of pencils. if they sold 105 pens, how many pencils did they sell?

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?

Lines a and b are parallel. what is the value of x? -5 -10 -35 -55

Rationalize the denominator- 12x/√x-10