Answer:
-99
Step-by-step explanation:
The properties of addition are
- Commutative property states that the sum of two number is the same regardless the order of the addends.
- Associative property states that the grouping of the addends is the same regardless the grouping order of three or more numbers being added.
- Distributive property states that the sum of two number which multiplies a third number is equal to the sum of the product of each addends with that third number.
Now, in the given expression [tex]-42-29-28[/tex]
We have three negative numbers, so if we extract the common sign, we would have
[tex]-(42+29+28)[/tex]
This extraction is possible because of the distributive property, we are applying it backwards to group all number.
Now, we sum all numbers grouped
[tex]-(99)[/tex]
Then, we multiply the negative sign with the number inside the parenthesis
[tex]-(99)=-99[/tex]
Therefore, the evaluation of the expression gives [tex]-99[/tex]
[tex]-42-29-28=-99[/tex]
