exam Maths Puzzle Numerical Ability

determine if the function {13,0}, {10,-9}, {9,-10}, is invertible and what is its inverse. thank you

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exam Other Question

Find two consecutive integers such that the sum of their squares is 5. How do I solve this problem? PLEASE HELP ME SOLVE THIS EQUATION!

FOR THE FUNCTION DEFINED BY f(x)=2-x^2, 0