exam Maths Puzzle Numerical Ability

-4+2i/y-i

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exam Other Question

Computation:

5 1/4 - 2 2/3
can i get this one checked please

multiply
2m(5m-3)(4m+7)
2m(5m-3)(4m+7)
2m(20m^2-21)
40m^3-42