What is the surface area of the cone?

C

Step-by-step explanation:

To find the surface area of a cone, you use the formula . Since we are already given the height and radius, all we have to do is plug in the values and solve.

      [solve inside of square root]

            [parenthesis]

                  [multiply]

Therefore, the closest answer is C.

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so: