Simplify start-fraction 2 over start root 5 end root end-fraction

You’re giving a cube with a length of 2.5 cm and a width of 2.5 cm and a high of 2.5 cm you place it on a scale and it is 295 g calculate the density

If each bricks costs and he can only buy one brick how much will it cost him to get the material to put around the outside of his garden?

What is the solution of the equation? 35√(x+2)3+3=27