exam Maths Puzzle Numerical Ability

angle BFA and angle DFE are vertical angles. If angle BFA=3r+12 and the measure of angle DFE=-8r+210, what is the measure of angle AFE?

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FIND THE SURFACE AREA OF A CUBE WITH EDGES OF 9 METERS. A hyperbola with question 25x^2 - 16y^2 = 400 has asymptotes of