exam Maths Puzzle Numerical Ability

Find the coordinates of the foci of the hyperbola: x^2/16 - y^2/4 = 1

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exam Other Question

(-5/x)*2 X (2x*4/y*3)*2

open parenthesis negative 5 over x close parenthesis quantity squared times open parenthesis 2x to the 4th power over y to the third power close parenthesis quantity squared Disapprove the statement that every positive integer is the sum of at most two squares and a cube of nonnegative integers.