exam Maths Puzzle Numerical Ability

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

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exam Other Question

Factor completely:
9x2 - 36y2
determine if the function {13,0}, {10,-9}, {9,-10}, is invertible and what is its inverse. thank you