The first 3 figures in a pattern are shown. 1
2
3
= 1 small square
O f(n)=n2-1
O f(n) = 2n2 + 1
O f(n)=(n + 1)2 + 2
O f(n)=(n + 1)2 - 2

If 20% of a number is 35, what is 50% of that number?

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

An energy drink company claims that its product increases students' memory levels. to support its claims, the company issues advertisements claiming that 8 out of 10 people (chosen randomly from across the country) who tried their product reported improved memory. the missing component in this study is a .