How do I solve this???

The square root of 9x plus 7 plus the square rot of 2x equall to 7

Look at this pattern ; 1,4,9, number 10000 belongs in this pattern . what’s the place of this number?

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?