## College Algebra (11th Edition)

$x=6cm$
Set up an equation that satisfies all three sides. $2(2x)+x=30$ Factor out the expression (x) and add. $5x=30$ Solve for x by dividing by 5. $x=6$ Do a mental check by making sure that the value satisfies the problem. $x=6$, and therefore $2x=12;2(12)+6=30$