exam Maths Puzzle Numerical Ability

What is one tenth of a billonth of a meter in diameter in scientific notation?

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exam Other Question

Ok I need help on this one please...

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Number 2

5x(-3x^4 + 4x) I have to multiply this one... The dimensions of a brick in inches are 2 by 4 by 9. How many such bricks are needed to have a total volume of exactly 2 cubic feet?