Step-by-step explanation:
the filled in circles are for anything less than or equal to or greater than or equal to.
Answer:
ab - ac + db - dc
Step-by-step explanation:
you distribute the variables inside the parenthesis
Answer:
42
Step-by-step explanation:
Substitute 9 in for m, and 6 in for n
n+4m
6+4(9)
Multiply
6+36
Add
42
Answer:
Step-by-step explanation:
"A mathematical model is a description of a system using mathematical concepts and language. The process of developing a mathematical model is termed mathematical modeling. Mathematical models are used in the natural sciences (such as physics, biology, earth science, chemistry) and engineering disciplines (such as computer science, electrical engineering), as well as in the social sciences (such as economics, psychology, sociology, political science).
A model may help to explain a system and to study the effects of different components, and to make predictions about behavior."
Answer:

Step-by-step explanation:
We want to find an expression that is equivalent to
.
Since we can;t get the options, we simplify the given expression.
The reason is that, the given expression will be equivalent to the simplified one.
We combine similar terms to get:

We now expand to get:

We perform the subtraction of the last two terms to get:

We now multiply to get:
