exam Maths Puzzle Numerical Ability

Hi

I need help finding the perimeter of a regular octagon with a side of 7.5 in.

thanx

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exam Other Question

I need to determine if the given x - value is a zero of the function - show work
f(x)-x^3+5x^2+2x-8
is x=-2 a root (??????????????)

f(x)=x^5 + x^4-9x^3-5x^2-36
Need to facto y/y-4 -6/y+7= y^2/y^2+3y-28