book Maths Puzzle Numerical Ability

A triangle has sides 2x-5, 3x+1, and 4x+2. Find the polynomial that represents its perimeter.

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book Other Question

Given the values of the 4 sides of a trapezium, find the length of the diagonals.
The length of the parallel sides are 10cms and 16cms. The other 2 non-parallel sides measure 12cm how do u do this problem y=2x+5 u have to make a input output box and i dont know how to do it. i have to get this done tonight can u please please show me?