All of them because they all have 3 sides
Answer:
57
Step-by-step explanation:
in this picture, the are half of the 114. If you add the two y angles it will equal the angle outside of the triangle
Answer:
![y = 7e^{-3t}](https://tex.z-dn.net/?f=y%20%3D%207e%5E%7B-3t%7D)
Step-by-step explanation:
![y = C_1e^{3t} + C_2e^{-3t}](https://tex.z-dn.net/?f=y%20%3D%20C_1e%5E%7B3t%7D%20%2B%20C_2e%5E%7B-3t%7D)
implies that when
,
.
![7 = C_1e^{3\times0) + C_2e^{-3\times0}](https://tex.z-dn.net/?f=7%20%3D%20C_1e%5E%7B3%5Ctimes0%29%20%2B%20C_2e%5E%7B-3%5Ctimes0%7D)
![7 = C_1+C_2](https://tex.z-dn.net/?f=7%20%3D%20C_1%2BC_2)
For the condition
, as
,
.
In the expression for
, as
, the term containing
vanishes. Hence,
![0 = C_1e^{3t}](https://tex.z-dn.net/?f=0%20%3D%20C_1e%5E%7B3t%7D)
![C_1 = 0](https://tex.z-dn.net/?f=C_1%20%3D%200)
Since ![7 = C_1+C_2](https://tex.z-dn.net/?f=7%20%3D%20C_1%2BC_2)
![7 = 0+C_2](https://tex.z-dn.net/?f=7%20%3D%200%2BC_2)
![C_2 = 7](https://tex.z-dn.net/?f=C_2%20%3D%207)
Substituting for
and
in
,
![y = 7e^{-3t}](https://tex.z-dn.net/?f=y%20%3D%207e%5E%7B-3t%7D)