exam Maths Puzzle Numerical Ability

add: -6+12+(-5)+3

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exam Other Question

how to find the log of any o mentally

how the log is calculated in the calculator
4x^2-20x+3/2x+1 + 2x^2-25x-27/4x+2
Okay, I can do this one, I just wanted to make sure my LCD was right
LCD=4x+2