book Maths Puzzle Numerical Ability

For the sequence below how would you solve this: write a recursive formula and fine the next three terms?

3,9,15,21

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book Other Question

Here is a scaling problem. You land on a island where giants are 12 times as tall. The weight of the giant is ??? times that of you. The area of the cross section of the giants bo f(x)=4x+2 Please Gragh this function