What is 400 turned into a decimal? ?

Write the system of equations represented by the matrix. 0 1 2 4 -2 3 6 9 1 0 1 3

He mass of a single atom of carbon can be found by dividing the atomic mass (12.01 g) by 6.022 x 10^23. which is the mass of a single carbon atom, correctly written in scientific notation with the correct number of significant figures?

1) prove that 731^3−631^3 is divisible by 100 2) prove that 99^3−74^3 is divisible by 25