book Maths Puzzle Numerical Ability

I'm not sure how to get the square root of 1/5
Could you help me? thanks!

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book Other Question

Leo's garden, which is 6m wide, has the same area as Jen's garden, which is 8 m wide. Find the lengths of the two rectangular gardens if Leo's garden is 3m longer than Jen's garden Please healp me I need a graph of these three problems. Please help me Thanks!!

b)
x -2 -1 0 1 2
y .25 .5 1 2 4

Given the table above, graph the function, identify the grap