exam Maths Puzzle Numerical Ability

The weight of 1m^3 of air is approximately 1.3 x 10^3 g. Suppose that the volume of air inside of a building is 3 x 10^6 m^3. How much does the air inside the building weigh?

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please help

FInd the product :

-5a^2(a^2-6a+7) Hi I need help with rational equations. The directions say to solve the equation choosing a method.

42. x/9-8/x=1/9

43. (x+42)/x = x

If you can do these and explain them I would very much appreiciate it.

Thank You!