exam Maths Puzzle Numerical Ability

If f(x)={(3,5), (2,4), (1,7)} and h(x)= {(3,2), (4,3), (1,6)} then what is f(h(4))?

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exam Other Question

24x^4y^2/3x^8y^2 In a circle whose radius is 15 inches, a chord is 12 inches from the center, what is the length of the chord