exam Maths Puzzle Numerical Ability

If the circle with centre(0,m) has equation x^2+y^2+6y+5=0, what is the value of m?

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exam Other Question

If a = 4 and b = -1, evaluate 5a - b. Hi, I am some trouble with two problems for my homework. I hope some one can help me please .

Perform the indicated operations:
2√[48] + 7√[12] �√[27]
Ra