Can someone help me please with this too :)

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?

The roots of the function f(x) = x2 – 2x – 3 are shown. what is the missing number?

How do you write 600 as a product of its prime factors (index! )