Answer:
![\bold{a_n=(-4)21^{n-1}}](https://tex.z-dn.net/?f=%5Cbold%7Ba_n%3D%28-4%2921%5E%7Bn-1%7D%7D)
Step-by-step explanation:
![a_1=-4\,,\ a_2=-84\,,\ a_3=-1764\,,\ a_4=-37044\quad\implies\ \ r=21](https://tex.z-dn.net/?f=a_1%3D-4%5C%2C%2C%5C%20a_2%3D-84%5C%2C%2C%5C%20a_3%3D-1764%5C%2C%2C%5C%20a_4%3D-37044%5Cquad%5Cimplies%5C%20%5C%20r%3D21)
{-84:(-4)=21 and -1764:(-84)=21 and -37044:(-1764)=21}
geometric sequence formula: ![a_n=a_1r^{n-1}](https://tex.z-dn.net/?f=a_n%3Da_1r%5E%7Bn-1%7D)
![a_1=-4\quad and \ \ r=21](https://tex.z-dn.net/?f=a_1%3D-4%5Cquad%20and%20%5C%20%5C%20r%3D21)
![a_n=(-4)21^{n-1}](https://tex.z-dn.net/?f=a_n%3D%28-4%2921%5E%7Bn-1%7D)
Answer: 3/5
Step-by-step explanation: thats your answer.
Answer:
Do 180-110=70 Then have it where 70/2=35. 35+4=39, 35-4=31, so the three angles are 39, 110, and 31.
Step-by-step explanation:
I’m pretty sure the answer would be Y=42°