$12 for 15 milliliters $8 for 10 milliliters

Write the fraction 9/50 as a decimal if needed round to the nearest hundredth

Ined this is due tomorrow and i dont know the answer can you find all the exponents

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?