Question

(a)The population of a certain city decreased by 7000 people.Write a signed number to represent this population change.(b)Isabel received 60 dollars.Write a signed number to represent this change.

Answer 1

(a). - 7000

(b) +60

Step-by-step 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.