book Maths Puzzle Numerical Ability

fine the nth term of the arithmetic sequence

a(small 1) = 52, d=12, n=102

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Simplify and evaluate:
(x3y-4z0/5x6y8)3

Thank you in advance. Find the equation of the line that passes through points (7,-2) and (5,-1)
Write the equation of the line in slope-intercept form.

I know the the slope intercept for is y = mx +b