book Maths Puzzle Numerical Ability

Given f (x) = 4x + 4, find f (x + 2)
A) 3x + 2 B) 4x + 6 C) x + 6 D) 4x + 12

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book Other Question

log(2x^2)=2log(2x). Is this true or false? 3x + 4y = 24

Can you please help me solve this problem. I'm looking x intercept the y intercept and the slope and rise over run.
Thank you for your help,

Angel