book Maths Puzzle Numerical Ability

what is the meaning of laws of radicals?

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book Other Question

The cost for a long-distance telephone call is $0.36 for the
first minute and $0.21 for each additional minute or portion thereof. Write an
inequality representing the number of minutes a person could talk without
exceeding $3. solve the equation below for y in terms of x
4x+3y=15