Exercise 14 Page 21

We want to find the sum and simplify the result of the addition. Let's look at the given expression! - 4.2+ 3.3Now, we can find the sum of two numbers with different signs. We can do so by subtracting the lesser absolute value from the greater absolute value. Then, we can use the sign of the number with the greater absolute value. Let's calculate the absolute value of the numbers! | - 4.2|=4.2and| 3.3|=3.3 Notice that | - 4.2| is greater than | 3.3|. This means that we should subtract | 3.3| from | - 4.2|. Let's do it!

|- 4.2|-|3.3|

AbsNeg

|-4.2|=4.2

4.2-|3.3|

AbsPos

|4|=4

4.2-3.3

SubTerm

Subtract term

0.9

Recall that the number with the greater absolute value is negative. This means that the sum is also a negative number, - 0.9.