exam Maths Puzzle Numerical Ability

Which is the number 0.0000042 in scientific notation?

A. 0.42times10^-7 B. 4.2times10^6 C. 4.2times10^-6 D.4.2times10^-5

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What is the supplementary of angle f, if angle f is 78 degrees? Can you please help me with this problem, (x+y)(2x-1)(x+1)