book Maths Puzzle Numerical Ability

Find the perimeter of a right triangle with one side 2cm and the hypotenuse 7cm.

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book Other Question

A rectangle has a length which is 3 more than its width. Write a polynomial P(x) which expresses the perimeter of this rectangle in terms of the width x.Help i apologize ahead of time if this is in the wrong cat.
how do you write an equation for this problem?
the sum of a number and five times the number??
when i see it my mind goes blank
any help would be appreciated