why a flat surface of a rectangular prism called faces?

Find the constant of variation for the relation and use it to write an equation for the statement. then solve the equation.

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?

How to find the exponential function y=ca^x, with points (1,2) and (2,1)