There are 10 cards facedown on the table. Four of the cards have stars on them and the other sex or blank. You win if you draw a card with the star. How can the game be fair

The diagram shows a 7cm by 6cm rectangle based pyramid. all the diagonal sides - ta, tb, tc and td are length 10cm. m is midpoint of rectangular base. work out height mt to 1 decimal place

The tile along the edge of a triangular community pool needs to be replaced? ?

Given the equation    = 5, solve for x and identify if it is an extraneous solution