Well i hope i don't look like a kid in this one too lol. nvm i still look like a kid. this was like 2 years ago

Which matrix multiplication is possible?

Solve the given system of equations. 2y= -x+9 , 3x-6= -15

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?