Solve for x, given the equation square root of x plus 9 − 4 = 1.

Add or subtract polynomial : –12qr? +13rq?

This is so hard and it’s for a test

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?