Please help with this one idk how to find slope lol

Asquare parking lot has 6,400 square meters what is the length in meters

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?

Charlie tosses five coins.what is the probability that all five coins will land tails up.