exam Maths Puzzle Numerical Ability

An ecological center wants to set up an experimental garden using 300m of fencing to enclose a rectangular area of 5000m^2 Find the dimension of the garden

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exam Other Question

Find the axis of symmetry.
y=-x^2-10x+7

I am still not getting this, can you assist one more time?
Thanks
16=1/9(x+1)^2