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Sagot :
Answer:
(a). - 7000
(b) +60
Explanation:
(a) The population of the city decreased. This means a certain amount was subtracted from the population number. Moreover, in maths a decrease is represented by the " - " sign
More precisely, the population was decreased by 7000 people.
Since 7000 were subtracted from the initial population, we represent this change by -7000.
(b). Isabel received 60 dollars. This means that after receiving the money, Isabel has more money than she has before. Now the word "more" in maths is represented by the "+" sign.
So we if want to change in Isabel's wealth, we'll represent it by +60 dollars.
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