A student has $78 in his checking account. If the student spends $12 on lunch, which number could be combined with the amount left in the account to make zero?

Question

–90
–78
–66
–12

Answer 1

To find the amount left in the account after spending $12, we subtract $12 from the initial amount of $78:

\[ 78 - 12 = 66 \]

Now we need to determine which of the given numbers can be combined with $66 to make zero. To do this, we're looking for a number \( x \) such that:

\[ 66 + x = 0 \]

To find \( x \), we can rearrange the equation:

\[ x = -66 \]

Among the options provided, the number that could be combined with $66 to make zero is:

–66

Thus, the answer is –66.