Equation: (Not sure if it's the right order...)
468 = 40x + 18(x - 3)
The fee Micheal charges each suscriber is $6
Work:
468 = 40x + 18(x - 3)
468 = 40x + 18x - 54
Mutilpy 18 & x and 18 & 3
468 = 58x - 54
Add 40x amd 18x
468 + 54 = 58x - 54
Add 54 to 468 to have -54 gone in 58x - 54
522 divide by 58 is 9
x = 9
9 - 3 = 6
46 because 8-3 equals 5 then 5 times 5 equals 25 to then add 11 to finally subtract 66-20 which equals 46
The rate is 360 customers per 30 days
There are two unit rates:
-- 12 customers per day
-- 1/12 day per customer
X=-b plus or minus the square root of 4ac divided by 2a
Area of each of the three sectors is equal to one-third of the circular area, which is
A=pi r^2 = pi (9)^2=81 pi
So area of each of the three sectors is 81pi /3=27 pi (m^2).