exam Maths Puzzle Numerical Ability

Would someone help me please? I need to find the length x of a triangle with the sides measuring 20cm (left side), x (right side), and 15cm (bottom).Thank You.

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exam Other Question

Give exact and approximate solutions to 3 decimal places.

x^2 - 7x + 5 = 0

The exact solutions are: ___________

The approximate solutions to 3 decimals places are: _____
identify the axis of symmetry, create a suitable table of values,and sketch the graph including t he axis of symmetry.

y=x^2-5x+3