exam Maths Puzzle Numerical Ability

how many years will it take $2600 to triple itself if it is invested at 3.6% simple interest

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exam Other Question

Please help me solve this equation:
Add
(6+3x+9x2+8x3)+ (4-3x+9x2-8x3)
use the quadratic formula to solve

-16y^2 -8y + 3 =0