exam Maths Puzzle Numerical Ability

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The solutions for {{{ mx^2 - 2x - 4m - 1 = 0 }}} are x1 and x2. Determine m so that x1 > 1 and x2 < 1.

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Pressure varies inversly as volume. When the pressure is 16 pascals, the volume is 84 liters. What would the volume be if the pressure is reduced to 12 pascals? I need to graph an ellipse and I don't know how. One problem is 9x^25y^2+36x+150y+36=0. I know that I need to put the problem in completed square form, but when I divide to make th