Question 442328
Recall that the formula for perimeter is {{{ p = 2l + 2w}}}.

In the problem it is stated that w = 10. And l is defined as 3w-4. Since w is 10, then l must be 3*10 -4 = 26.  

We have:

{{{ l = 26 }}}
{{{ w = 10 }}}

Now it's time to plug and chug.

{{{p = 2*26 + 2 *10  = 52+20 = 72}}} inches.