exam Maths Puzzle Numerical Ability

i need help on what says: 3x-2

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exam Other Question

$2000 compounded for 10 years at 12% annually.

First, we have to find the values for the formula.

P = Principle = $2000
r = rate = 12% = 0.12
t = number of years = 10
n = find the slope of the line containing the following

1)(-1,6)and(0,3)
2)(12,-1)and(34,2)
3)(6,6)and(7,4)

THANKS A LOT VERY MUCH !!!!!!!!