Question 85581
Perimeter:

{{{P=2w+2L}}}


where {{{w=3x-4}}} and {{{L=7x+10}}} (in either order)


{{{P=2(3x-4)+2(7x+10)}}} Plug in the given dimensions


{{{P=6x-8+14x+20)}}} Distribute


{{{P=20x+12)}}} Combine like terms