exam Maths Puzzle Numerical Ability

My teacher recently told us
ELEVEN plus THREE equals TWO.

And she wants us to figure out how.
So how does
11 + 3 = 2?

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exam Other Question

f (x) = x2 - 7x + 10; find (a) f (0), (b) f (5), and (c) f (-2).

evaluate each function for the value specified please.

Thank you :) a. Let a,b,c be three distinct positive real numbers.
1) Prove that a^3+b^3>a^2b+b^2a.
2) Write down, without proving them, similar inequalities for (a^3+c^3) and (b^3+c^3).
3)