Adding and subtracting functions f (n ) = −2n^3 + 3n^2g(n) = −2n − 4 Find f (n )+ g(n)

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

The anwser cause i do not understand just plez

How can you check that you have correctly converted frequencies to relative frequencies?