Mathematics: How do i solve this problem?

Find the common denominator:(x+6)(x+5) - 9(x+4) 9(x+6) x^2 + 2x - 6 9(x+6)...

How do i solve this problem? - id2744496, montgomerykarloxc24x

Ответ:

amazinga

04.01.2022

Mathematics

$\large\boxed{8\ m}$

Step-by-step explanation:

$\text{The formula of an area of a circle:}\\\\A_O=\pi r^2\\\\r-radius\\\\\text{We have the radius 2r and the radius r. Substitute:}\\\\Larger\ circle:\\\\A_L=\pi(2r)^2=\pi(2r)(2r)=4\pi r^2\\\\Smaller\ circle:\\\\A_S=\pi r^2$

$\text{We have the sum of the areas of the circles}\ A=80\pi\ m^2.\\\\A=A_L+A_S\\\\\text{Substitute:}\\\\4\pi r^2+\pi r^2=80\pi\\\\5\pi r^2=80\pi\qquad\text{divide both sides by}\ 5\pi\\\\r^2=16\to r=\sqrt{16}\\\\r=4\ m\\\\The \radius\ of\ the\ larger\ circle:\\\\2r=2(4m)=8m$

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