exam Maths Puzzle Numerical Ability

Find the domain of the function algebraically:
f(x) = (x^2+ 4)^1/2

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exam Other Question

A rectangular hole 2cm wide and x cm long is cut in a retangular sheet 3.5cm wide and y cm long. The lentgh of the hole is 1 cm less than the length of the sheet. After the hole is A three piece suit costs exactly $100. No more no less. It has a vest, pants and a coat. The pants cost twice as much as the vest. The coat costs twice as much as the pants. How much does each piece cost.