ok, here the formula measure of each interior angle of regular n-gon

octagon ~ 8-gon, so
180° - 360°/8 = 135° (A)
for the sum, we just need multiply the formula above with n
nonagon ~ 9-gon
sum = 9(180° - 360°/9)
= 9(140°) = 1260 (C)
Answer:
x = -1
x = -2/3 = -0.667
Step-by-step explanation:
The equation of g(x) is 
Explanation:
Given that the function f(x) is 
Also, given that the function g(x) is a vertical stretch of f(x) by a factor of 4.
We need to determine the equation of g(x)
<u>Equation of g(x):</u>
The vertical stretch of the function can be determined by multiplying the factor 4 with the function f(x).
Thus, we have,

Substituting the values,we have,

Simplifying the values, we get,

Hence, the equation of g(x) is 
You can skip 4 in that equation and you'll be left with 2x+12=0, which gives you 2x=-12 and finally, x=-6
Y-6=2(x+3) is the answer i’m positive