exam Maths Puzzle Numerical Ability

Its about general terms. I dont get them at ALL!! like one practice problem says find the general term for 8,1,-6,-13,-20. Please help!!

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exam Other Question

The diameiter of a bushing is 1.47 in.The bushing has a tolerance of 0.006 in. Find the lower and upper limits of the diameter of the bushing what is the slope intercept form of 5x+3y