to find the angle at point E you would take 180-105. which equals 75.
75+55= 130
180-130=50
Angle D= 50 degrees
Angle C= 55 degrees
Angle E= 75 degrees
T(n)=t(0)xR to the n power since the sequence is geometric
t(0)=1.5 because 1.5x2=3
R=2
A. about 14
divide 72/5= 14.4 which rounds to 14
