Which measure describes how much a sample mean varies when different samples are chosen?

Which expression is equivalent to (9x - 3 1/ + 1 3/8)

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?

Given ab and cb are tangents of p, and m =10°. what is the measure of abp?