exam Maths Puzzle Numerical Ability

Determine whether sqrt49/100 is rational or irrational.

Can anyone help me with the steps to figure this out? Thank you!

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exam Other Question

Cara wants to invest $16,000 in certificates of deposit(CDs). For tax purposes, she wants her total interest per year to be $900. She wants to put $1000 more in a 2-year CD than in 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)