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What solid 3D object is produced by rotating the square about line \blue mmstart color #6495ed, m, end color #6495ed?

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

If x is 6, then 7x= a. 13 b. 42 c. 42x d. 76

Tell whether the two rates form a proportion