book Maths Puzzle Numerical Ability

What are the first five terms of the sequence with a(subscript1) =3, a(subscript n+1)= a(subscript n)+ 5

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book Other Question

What is the formula to find the distance between 2 points on a graph. For example the points are (-2,5) & (-3,-1) In the period of a year, and investor lost twice as much as he gained.If he originally had $10,000.00 and now has $8,000.00 what amount did he gain and what did he lose?