Question 931715
a)5 angles, 5 sides.
b) Interior angles sum to {{{(5-2)*180=540}}}
{{{x+x+20+2x+2x-10+50=540}}}
{{{6x+60=540}}}
{{{6x=480}}}
{{{x=80}}}
c) The first angle is {{{80}}}. I'll leave it to you to work out the others.