4 + 4 + 4 x 4 - 4
use pemdas please

Complex numbers multiply √-4 * √-25 and show all intermediate steps. alternative notation is sqrt(-4) * sqrt(-25).

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?

    choose the correct definition for  extremo.  a.  end      b.  extra      c.  extract      d.  eventual