Question

the angles of a heptagon are( X + 3 )degree( 2 X + 5) degree( X + 8) degree( 3 X + 1 )Degree( 5 x- 6) degree (2 X + 9) degree and( x - 5 )degree calculate x

Answer 1

in Septagon total angles sum =(7-2)180
=900degrees
total sum of angles=15X-15
15X-15= 900
15(X-1)=900
X-1=60
X=61degrees