What is the equation of the line?

What is the factored form of the following expressions? d^2 – 13d + 36

45% of the trees in a park are apple trees. there are 27 apple trees in the park. how many trees are in the park in all?

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?