book Maths Puzzle Numerical Ability

the perimeter of a church window is 60 inches. if the window is in the shape of a regular pentagon, what is the length of each side of the window?

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Can someone show me how to rationalize the denominator...Please

1/4-sqrt2 one divided by 4 - square root of 2

Thanks find the greates common factor of p and q. then divide the common factor so that the leading coefficient is p(x)=x4+2x^3+6x^2+8x+8 q(x)=x^4+2x^3+8x^2+8x+16 the greates common facto