Practise the method.Example 1Each ticket costs $4. There is one booking fee of $3. Which expression gives the total cost for x tickets?Show worked answerAnswer: 4x+3Ticket cost is 4×x; add the single booking fee 3.Example 2A number x is increased by 3, then the result is multiplied by 5. Which expression matches?Show worked answerAnswer: 5(x+3)The first result is x+3. Multiply the whole result by 5, so brackets are needed.Example 3A rectangle has length x+2 and width 5. Its perimeter is 2x+k. Find k.Show worked answerAnswer: 14P=2(x+2)+2×5=2x+14.