If f(x) = 3x - 12 and x = 9
then substitute 9 in place of x
f(9) = 3(9) - 12
f(9) = 27 - 12
f(9) = 15
The surface area of the cone is given by:
![SA=\pi r^2+\pi Lr](https://tex.z-dn.net/?f=SA%3D%5Cpi%20r%5E2%2B%5Cpi%20Lr)
where r is the radius and L is slant height.
In this case r=5 and L=12. Then the surface area is:
![\begin{gathered} SA=(3.14)(5)^2+(3.14)(12)(5) \\ =267 \end{gathered}](https://tex.z-dn.net/?f=%5Cbegin%7Bgathered%7D%20SA%3D%283.14%29%285%29%5E2%2B%283.14%29%2812%29%285%29%20%5C%5C%20%3D267%20%5Cend%7Bgathered%7D)
Therefore the surface area is 267 squared centimeters,
Answer:
x=52
Step-by-step explanation:
Original Equation: (3x-6)+(2x-8)+(x+10)+(x)=360
Combine Like Terms: 7x-4=360
Distribute: 7x=356
Simplify: x=52