exam Maths Puzzle Numerical Ability

solve the radical equation check your solutions

/2y+7+4=y

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exam Other Question

find a quadratic function with vertex (4,-5) and containing the point (-3,1). Give you solution in the form f(x)=a(x-h)^2+k I had this problem on a test. I found the inverse function, but I got stuck on the checking.
Find the inverse function for f(x)=4x-2/3x. Check your answer.