- How many 9inch square tiles are needed to cover the floor of a 12' x 18' rectangular room?

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What is biochemistry? 1,870,1706? In the problem: (x-8)^2 = x^2-16x+64
How is -16x brought into the equation? How do you ask out your pharmacist, usually they lock up your meds, but I got $275 worth of meds, so she trusted me, so, how do I ask? In the problem: 5x(x+1)^2 = 5x^3+10x^2+5x Please explain how this +10x is factored out of the original equation.?