exam Maths Puzzle Numerical Ability

I really need help finding the partial sum of the arithmetic sequence
aof n=2n; Sof 7

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exam Other Question

x-y=0
3x-y=2 The percent of single women within 20-24 age that never married went from 55% in 1970 to 73% in 2000. Let 1970 be year 0 and 200 be year 30.
A)Find and interpret slope line throu