exam Maths Puzzle Numerical Ability

How long will it take to double my money at 8% interest rate and continuous compounding?

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Ok I am stumped...

Page 455
Number 14

I have to find the domain and range of the relation and then determine whether the relation is a function...

{(85,3),(95,11),(110,15),(110,20)} Which of the ordered pairs
(7, 1), (9, 0), (5, -2), (-7, 8)
are solutions for the equation x + 2y = 9?
Hint: There can be more than 1.