exam Maths Puzzle Numerical Ability

What number exceeds 23 by 4 more than twice the amount by which 15 exceeds -3?

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exam Other Question

Find the inverse of this function, and state the domain and range of both the original function and the inverse: F(x) = sqrt(2x-3) x2= (xSquare), y2=(ySquare)
x2+y2=4x-2y+1=0
(x-4)2 + (y+7)2 = 64