What is the surface area of an equilateral trianglular prism with bases that have an area of 15mm^2 and three rectangular faces that each have an are of 20mm^2

Therefore, we conclude that  the surface area of an equilateral triangular prism is 90mm^2.

Step-by-step explanation:

We have the equilateral triangular prism with bases that have an area of 15mm^2 and three rectangular faces that each have an are of 20mm^2.  

We calculate  the surface area of an equilateral triangular prism.

We get :

Therefore, we conclude that  the surface area of an equilateral triangular prism is 90mm^2.

(n^3 - n)

= n(n-1)(n+1)

since it is divisible by 3 and 2 ,because it is a multiple 3 consecutive number

if, n-1 is odd then n+1 is also odd, then it is a multiple of 9

but if, n-1 is even then n+1 is also even, then it is a multiple of 4

so, largest multiple = max(9*2, 4*3) = max(18, 12) = 18

answer: add the !

step-by-step explanation: then we will answer