Five times a number is 42 greater than the opposite of the product of 2 and the number. what is the 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?

Extra points! find the missing dimension! need asap

Which equation can be simplified to find the inverse of y = 2x2^2