book Maths Puzzle Numerical Ability

I need help calculating the area between the y-axis and y = x squared, from y = 4 and y = 9. I beleive my graph would show a parabola, however I am not sure. Would you please hel

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z-12=6 how do I work this out what is the exact value of sin 22.5 degrees using the sum, difference, half, or double angle formulas and the exact value chart in the solution.