exam Maths Puzzle Numerical Ability

the nth term sequence is T(n)=4n-3 what are the first 5 terms of the sequence and can you explain it.

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exam Other Question

6x+5x+1=0 If I invest $18,750 in two different accounts and one account earns 12% interest and the other earns 10% interest, and at the end of the year have a total $20,867 (original amount + interest), how much did I invest in each account?