By doing the addends of 4+5 :)
Answer:
Step-by-step explanation:
(2 , 0) ; (0, 1)
Slope = 

m = -1/2 ; (2 , 0)
Equation of the line : y - y1 = m(x - x1)

slope = (-1/2)
y - intercept = 1
Answer:
r = 18 cm
Step-by-step explanation:
Hello
The formula for circumference is 2*Pi*r
So you have the valur for that formula:
2*Pi*r = 36Pi
r = 36/2
r = 18 cm
Bes regards
Sum of exterior angle of a polygon is 360°
An n-sided polygon has n equal exterior angles.
360/n - 360/(n + 1) = 12
360(n + 1) - 360n = 12n(n + 1)
12n^2 + 12n = 360
n^2 + n - 30 = 0
(n - 5)(n + 6) = 0
n = 5 or n = -6
Therefore, n = 5