The next number is 27.
You can find this by finding the common ratio between 3 and 9 and multiplying 9 by the common ratio. The common ratio is 3
Answer:
n= 0.682539 but if you want it in fraction form its 43/63
Step-by-step explanation:
1. Consider the pyramid ABCDE in the figure 1 attached:
Each side of the square base equals

(units)
Area of 1 lateral side of pyramid ABCDE is

so the total lateral area is

(units squared)
and the total surface area is

(units squared)
2. Now consider the second figure KLMNP, Sydney's pyramid:
The lateral area is

so the total area of the second pyramid is

So 2 things can be said about the areas:
i) the lateral area of Sydney's pyramid is

times larger than the lateral area of the original pyramid.
ii) The total area of Sydney's pyramid is

units squared larger than the total area of the original pyramid.
It 0.25 because if you put both together you get 2+2.5=4+2x then solve for x and you get x=0.25