3420°
explanation:
the equation of the sum of interior angles are (n-2)x180
polygon above has 21 sides so you sub n as 21 and plug the equation in the calculator
Answer:
X Company charges
more than Company Y
Step-by-step explanation:
Given:
Cost of X company = 
Cost of Y Company =
for n minutes
Cost of X company for n minutes = 
Cost of Y Company for n minutes =
Difference for n minutes we get by Subtracting Cost of Y Company for n minutes by Cost of X company for n minutes
Difference for n minutes =
=
X Company charges
more than Company Y
Angle ABC=DEF then
Side AB=DF
Side BC=EF
and Side CA=FD
So if side ac=DF
side DF=6cm.