What does it mean to translate by (-8 over 0)

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 f(x)=x+7 and g(x)=1/x what is (fog)(x)

The difference of two numbers is 40. find the numbers if 0.3 parts of one number is equal to 37.5% of the other one.