exam Maths Puzzle Numerical Ability

How to solve the following equation:
_
/x-1=3 _
(This / symbol is for square root)

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exam Other Question

The dosage of a certain drug is related to the weight of a child as follows: 50mg of the drug and an additional 15 mg for each 2 Ib of body weight about 30 Ib. Sketch the graph of Solve by graphing.Indicate wheter it is independent,inconsistent,or dependent.: y = 3x - 4
y = -2x + 1