You and 3 friends decided to share a pizza. If everyone got 2 pieces each, how many total pieces of pizza were there to begin with?

One line passes through (-7,-4) and (5,4) . another line passes through the point (-4,6) and (6,-9)

Water flows at a steady rate from a tap. its takes 40 seconds to fill a 4 litre watering can from the tap. the rate at which water flows from the tap is halved. complete: 4 litres into cm3

Is the square root of 4 plus the square root of 16 rational?