Mr and Mrs Smith each have a car. Mr Smiths car has needed 6 tyres and 2 batteries since new. Mrs Smiths car has needed 9 tyres and 1 battery. a. How many tyres and batteries have the smiths needed together? b. Use t to stand for a tyre and b to stand for a battery. Write down an expression and then simplify it, to show how to get your answer in part a.
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