Positive numbers are numbers that are greater than 0. They can be written with or without a positive sign. Negative numbers are less than 0. They are always written with a negative sign. Here are some examples of both kinds of numbers.
With this information in mind, we want to write a positive or a negative integer that represents the given situation. Remember that integers are the set of whole numbers and their opposites.
A profit of $9
The word profit tells us that we are getting money. This means that the amount of money is increasing. To express the increase of an amount, we use a positive number.
9
Extra
Opposite Numbers
Two numbers that are the same distance from 0 on a number line, but on opposite sides of 0, are called opposites.
Opposite numbers have the same absolute value. Absolute value is what we call the distance that a number is from 0.
|-9|=9 and |9|=9
