Answer:
270
Step-by-step explanation:
2b - 6 = -4
2b = -4 + 6
2b = 2
b = 2/2
b = 1
The common ratio r = 2.
Now s2 = a1r and s4 = a1r^3 where a1 = first term and r = common ratio so
s4 / s2 = a1r^3 / a1r = r^2 = 32/8
r^2 = 4
r = 2.
Angles in a straight line add up to 180°.
Angles in a triangle add up to 180°.