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MissTica
3 years ago
14

Jacob  earned $80 babysitting and deposited the money into the his savings account.  The next week he spent $85 on video games.

 Use integers to describe the weekly changes in Jacob's savings account balance.
Mathematics
2 answers:
Colt1911 [192]3 years ago
4 0
Week 1: +$80
Week 2: -$85

∆ = +$80 + (-$85) = -$5
cluponka [151]3 years ago
3 0
Assume that the original amount in the account is x.

<u>We will use:</u>
+ to indicate addition of amount (increase in the amount of money)
- to indicate subtraction of amount (decrease in the amount of money)

<u>We have two changes:</u>
<u>1- The first week,</u> he earned $80 and deposited them into the account.
This means that he added $80 to the already existing amount.
Therefore:
amount in account = x + $80
The integer representing this increase would be +80

<u>2- The second week, </u>he withdrew $85 from the account.
This means that he removed $85 from the already existing amount
Therefore:
amount in account = (x+$80) - $85
The integer representing the decrease would be -85

<u>3- getting the change that occurred:</u>
change in account = x + 80 - 85 = x - $5
This means that for the two weeks together, the amount of money in the account decreased by $5

Hope this helps :)
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