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What’s is the equation of the new function?

Which is an equation for the nth terms of the sequence 12,15,18,21

One line passes through (-7,-4) and (5,4) . another line passes through the point (-4,6) and (6,-9)

On a cm grid, point p has coordinates (3,-1) and point q has coordinates (-5,6) calculate the shortest distance between p and q give your answer to 1 decimal place