exam Maths Puzzle Numerical Ability

i cant find solution on this algebra problem because of lack knowing on this proble(4x^4 y^3) (-5x^5 y^2)

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exam Other Question

what is the difference of 3 and 5 times a number? a(b+c) is the equations I am suppose to use 2.1x-6+1.6x=12.5
please help me i am totally lost with this problem!!!!!!