What is 3x7/10 I need help as soon a possible homework is due tomorrow

What is the value of r of the geometric series?

Add the two expressions 3.8b - 7 and 2.9b + 9 enter your answer in simplified form

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?