An element with a mass of 700 grams decays by 6.1% per minute. To the nearest tenth of a minute, how long will it be until there are 220 grams of the element remaining?

What is this inequality notation? t is less then or equal to 2

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

With alll of except for the 2 that i did already