exam Maths Puzzle Numerical Ability

help would be appreciated with this question, thanks.

4a-3ab-4ab+3b-6a

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exam Other Question

Rewrite the expression as a sum, difference,and/or multiple of logarithms
log2[2 square root x / 3]
Can someone please help me?

Solve the system by graphing.
x – y = 5
x + y = 3