Problem solving draw a model to explain how to find out how many times as many 45 is as 9?

Y=4x^2+x-1 solve using quadratic formula

Iwant to know what 3g+5h+4g-2h is my teacher is too selfish to tell us

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