Question 974609
The area of a circle is given by the expression 3.14(4x+36x+81) what expression represents the diameter of this circle ?
===============
{{{Area = pi*r^2 = pi*(4x + 36x + 81) = pi*(40x + 81)}}}
{{{r^2 = sqrt(40x + 81)}}}
{{{r = sqrt(40x + 81)}}}
{{{d = 2r = 2sqrt(40x + 81)}}}