Question 365967
Once the angle is beyond 90, it's no longer acute.
{{{60<3x+18<105}}}
{{{3x+18>60}}}
{{{3x>42}}}
{{{x>14}}}
.
.
{{{3x+18<105}}}
{{{3x<87}}}
{{{x<29}}}
.
.
{{{14<x<29}}}
.
.
.
Acute: {{{3x+18<90}}}
Right: {{{3x+18=90}}}
Obtuse: {{{3x+18>90}}}