Guys, please hels asap imma mark as brainless

Is a positive integer raised to a negative power always positive

Simplify 15(x - 4)(x -1)-3(x + 4)(x - 1) with steps

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?