book Maths Puzzle Numerical Ability

I have to solve for x, and write the answer in interval notation.

2x^2-13x+15 <(or equal to) 0

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book Other Question

how do u do this?? f(x)=3xexponet 2 - 5x find f(-3) can you please help me with {x+12y=68
{x=8y-12