Pita has 12 coins in her bag. There are three £1 coins and nine 50p coins.

She takes 3 coins from the bag at random.

work out the probability that she takes exactly £2.50​

Abby is preparing fruit punch for her party. she starts with a bowl filled with liquid that has 1/2 fruit juice and 1/2 sprite, but she decides it's too fruity. so she pours out 1/4 of the liquid, and then fills the bowl up again with sprite. what fraction of the punch is now sprite?

The suare root of 9x plus 7 plus the square rot of 2x equall to 7

Yvaries inversely as x. y =12 when x=5. find y when x=4