book Maths Puzzle Numerical Ability

(5,r) (2,3) slope=2

Question says determine the value of 'r' so that a line through the points with each given coordinate has the given slope. draw a sketch of each situation. P

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Help...This has me stumped..
How long does it take for an investment to double in value if it is invested at 10% per annum compounded monthly? Compounded continuously??
I got th Help!! The task is to write the resulting polynominal in standard form and indicate its degree.

Problem: (-7x^3 + 6x^2 - 11x + 13)+ (19^3 - 11x^2 + 7x -17)

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