exam Maths Puzzle Numerical Ability

sqrt((5-sqrt20)^2)+ (sqrt(sqrt20-5))^2

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exam Other Question

The length of a rectangular playing field is 5 feet less than twice its width. If the perimeter of the playing field is 230 feet, find the length and width of the field.

Let W = the width of the rectangle and L=length Can you PLEASE help me figure these out. I am clueless!Thanks in advance!

Solve.
1) Square root of 3x-8 +4=6

2)Find the distance between (1,-3)and(4,3)