Help pls math

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?

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?

The points (1, 7) and (0, 2) fall on a particular line. what is its equation in slope-intercept form?