stock price dropped $4 for tuesday and then gained $11 on wednesday what is the increase and decrease for the two days
Hm. I'm not exactly sure what the question is asking. If it's asking for a net increase or decrease, then you have a couple of steps. First off, let's say that a decrease is the equivalent of subtraction and an increase is the equivalent of addition. So, a $4 drop means we have -4 and then a $11 gain means we add 11 to that -4. The result is -4 + 11 or 11 - 4 which is 7. Since 7 is positive and not negative, we say that there is a net *increase* of $7 for the two days.
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