Question 738475


if QRST is a rectangle, then each angle is {{{90}}}°

so, angle {{{Q=90}}}°

if angle {{{Q}}} is equal to {{{10x-80}}}, then {{{10x-80=90}}}

 {{{10x-80=90}}}.....solve for {{{x}}}

 {{{10x=90+80}}}

 {{{10x=170}}}

{{{x=170/10}}}

{{{x=17}}}