Combine like terms to create an equivalent
expression.
7.4z - 5(-1.6z + 2.4)

Explanation:

The initial expression that we have in this problem is

First of all, we multiply the -5 by all the terms in the brackets. Doing so, we get the following expression:

Now we can combine the like terms, which are the terms having the same variable.

Here the like terms are:

and

-12

Combining the first 2 terms we get

Therefore, the final expression overall is:

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.