You need change for the till.  you are given £10 worth of 20p coins.  how many 20p coins is this?

The perimeter of a stage is 116 feet. it is 17 feet wide. how long is it?

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?

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)