exam Maths Puzzle Numerical Ability

find the nth term

1 1
2 6
3 15
4 28

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exam Other Question

The area of a rectangle is 216ft. squared. The length of the rectangle is 18ft. If a scale drawing of the figure has a scale of 1/2in. = 6ft. What are the dimensions of the rectangle on the scale drawing? a=bx+cx solve for x