exam Maths Puzzle Numerical Ability

Factor by grouping:
18a^3 - 24a^2b + 15ab^2 - 20b^3

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exam Other Question

give the solution set to the system

y=9-2xand 2x-5y=15
Hi,

I need help how would I solve the following Linear Equations and their Solutions

3x/4 = 6

I do appreciate your help, I just so confussed.