exam Maths Puzzle Numerical Ability

please tell me how to solve

what is the difference between the sum of the prime factors of 18 and the sum of the prime factor of 25?

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exam Other Question

Hi, could you please help me with this problem. "Find the equation for the conic described, and the conic described is ellipse with foci at (positive or negative 5, 0) and endpoin Find the missing values that solve this equation.
y = 5 -4x

(5, ____) (1, ____) (-1, ____)


I need the missing points and the steps :)