Solve for k, the constant of variation, in an inverse variation problem where y=17 x=6

Find the difference (8ab+a+2) - (3ab+6)

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?

Which of the following is not a subset of {1,2,3}?