exam Maths Puzzle Numerical Ability

Could someone answer me this can sqrt- be considered rational???

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exam Other Question

find vertex and intercept coordinates of the following
a=b^2-6b-16 Triangle EWS has a perimeter of 26 and SE = 1/2 WE. The midsegment parallel to WS = 4. Find the lengths of the three sides of this triangle.

thank you soo much