Question

In which of these situations do the quantities combine to make 0? O A. In the morning, the temperature rises 10 degrees. In the evening, it falls by 15 degrees. OB. On Monday, Huang withdraws $30 from a bank account. On Friday, he deposits $30 into the account. OC. A diver descends 25 feet. She then descends another 25 feet. D. Rosita receives $15 for pet sitting. She then spends $10 on a book. ​

Answer 1

B. On Monday, Huang withdraws $30 from a bank account. On Friday, he deposits $30 into the account.

Explanation:

You want to identify the situation that results in 0 net change.

Zero

To make zero, we can add opposite values.

A +10 -15 = -5 . . . not zero

B -30 +30 = 0 . . . . the situation of interest

C -25 -25 = -50 . . . not zero

D 15 -10 = 5 . . . not zero

Choice B describes a situation with a net change of zero.

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Additional comment

One needs to be careful with banking. Withdrawing $30 from an account that has less than $30 in it may result in an overdraft charge, causing the net change to be the amount of that overdraft charge. We'd rather see this scenario described as deposing $30 before the $30 withdrawal is made.

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