exam Maths Puzzle Numerical Ability

Can you please help me with this problem, (x+y)(2x-1)(x+1)

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exam Other Question

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 2/3y=60
two over three times y equals sixty
I am not sure how to solve this equation, please show me step by step so that I will be able to do in the future