exam Maths Puzzle Numerical Ability

Find f(15) for f (x) = x^2-4/8-x^3

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exam Other Question

three eggs are required to make two dozen muffins. how many eggs are nedded to make 12 dozen muffins For about what value(s) of x does g(x) = k(x) if g(x) = 2x^2 -8 and
k(x) = -x^2 -2?

a. x = 2,-2
b. x = 2.3, -2.3
c. x = 1.4
d. x = 1.4, -1.4