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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I submitted this wrong and I still need help on it

solve each of the eqautions be sure to check the solution

square root 2y +7 +4 =y

thank you Write the quadratic equation with a lead coefficient of 1 whose roots are (-1/2) and (4/5).