book Maths Puzzle Numerical Ability

-300=15x,..

1/2x=3 5/6,..

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book Other Question

Use the Intermediate Value Theorem to show that the graph of the function has a zero in the given interval. Round the zero to two decimal places.
f(x) = 2x3 + x2 - x - 5; [1, 2] Please help The sum m & n ,divided by the difference m & n