[tex](2\sqrt{x} +3)(2\sqrt{x} -1) -\sqrt{x} (-3+4\sqrt{x} )=0

The product of two negative rational numbers is always zero sometimes zero never zero

In the diagram of circle a what is m

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?