exam Maths Puzzle Numerical Ability

obtain T(x,y,z)where T is linear operator on R3 whose space is the subspace spanned by the vector (1,2,2) and (1,0,-1)

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exam Other Question

Determine whether sqrt49/100 is rational or irrational.

Can anyone help me with the steps to figure this out? Thank you!
Graph this equation.
y=x^2 - 4x