Question 462875
given:

the length of a rectangle is fixed at {{{L=14cm}}}. 


find:

what widths {{{W}}} will make the perimeter greater than {{{P>70cm}}}


{{{P=2(L+W)}}}

so you need

{{{2(L+W)>70cm}}}


{{{2(14 cm+W)>70cm}}}


{{{28cm+2W>70cm}}}

{{{2W>70cm-28cm}}}

{{{2W>42cm}}}

{{{W>42cm/2}}}

{{{W>21cm}}}