Exercise 7 Page 44

We want to determine the value of the given expression. Let's look at our expression! - 9.74+( - 2.23) Notice that both addends in our sum have the same sign. In this case, we can find the sum by adding their absolute values.

Notice that both numbers in our sum expression have a negative sign. This means that the sum of - 9.74 and - 2.23 is also a negative number, - 11.97.