exam Maths Puzzle Numerical Ability

please help solve the following:

(x+3)^3/2 = 8

thanks

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exam Other Question

The cost of producing a number of items x is given by C=mx+b , in which b is the fixed cost and m is the variable cost (the cost of producing one more item).

a) If the fixed cos How do I write thte equation of a circle with the center at (-2,2) and a radius of 4?