Find the unit rate and round to the nearest cent?

Simplify the expression 10/11(22z) + (a+5) -1

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?

Combine like terms to make a simpler expression 3z+z