The density of a mixture measures 1015.3 kilograms per cubic meter. Use scientific notation to represent the density of the mixture?

1.0153 x 10^3

essentially, scientific notation requires you to take a very large or very small number and simplify it into the first few digits times 10 raised to the power of x.

Although realistically, there is no practical reason to simplify a number that is already that close to 1.

1.0153 x 10^3 kg/m^2