Question 288163
P = 2L + 2W = 28 
L = W + 4
{{{ 2(W + 4) + 2W = P  }}}
{{{ 2W + 8 + 2W = P  }}}
{{{ 4W + 8 = 28  }}}
{{{ 4W = 20 }}}
{{{ W = 5 }}} and {{{ L = cross(5 + 4) = 9 }}}
5 * 9 = 45 sq inches and bob's your uncle!