Exchange Rates and Currency Exchange

Exercise 7.3.2 : Give It Some Thought

1. If the exchange rate in terms of US dollars per unit of euros increases, which currency weakened?
2. If the Australian dollar weakens against the Canadian dollar, did the exchange rate increase or decrease in terms of Australian dollars per unit of Canadian dollars?
3. If the exchange rate in terms of yen per unit of the Mexican pesos decreases, which currency weakened?
4. If the British pound (£) appreciates against the US dollar, did the exchange rate increase or decrease in terms of pounds per unit of US dollars?