exam Maths Puzzle Numerical Ability

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I need to find the domain of the function

f (x) = x-3/3x+1

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exam Other Question

A bank contains 30 coins, consisting of nickles, dimes, and quarters. There are twice as many nickles as quarters and the remaining coins are dimes. If the total value of the coins is $3.35, what is the number of each type of coin in the bank? A number cube is rolled and a number card is drawn from cards numbered 1-14. Find the number of possible outcomes for the situation.