book Maths Puzzle Numerical Ability

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

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book Other Question

I HAVE TO FACTOR THE POLYNOMIAL COMPLETELY. BUT I AM STUCK.

128xcubed yto the sixth - 50xto the sixth ycubed
it should look like this
128y3x6-50x6y3
WHAT DO I DO??PLEASE HELP ME. THANKS! A triangle has sides 2x-5, 3x+1, and 4x+2. Find the polynomial that represents its perimeter.

Please Help.

Thank you.