Solve the system of linear equations by substitution! SHOW WORK PLEASE

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?

Which will form a composite function?

Of the 304 people who attended a school play, 5/8 were students. how many of the people who attended were students.