(will give brainliest if it's correct) 28 points

Don't worry, I'll help you!

1. What is a function?

"In mathematics, a function is a relation between a set of inputs and a set of permissible outputs with the property that each input is related to exactly one output. An example is the function that relates each real number x to its square x2."

2. What is the difference between a linear and non-linear function?

"The equation of a linear function has no exponents higher than 1, and the graph of a linear function is a straight line. The equation of a nonlinear function has at least one exponent higher than 1, and the graph of a nonlinear function is a curved line."

3. Constant Interval, and how does it appear on a graph

Definition: 
"Determine the intervals on which a function is increasing, decreasing or constant by looking at a graph. Determine if a function is even, odd, or neither by looking at a graph. Determine if a function is even, odd, or neither given an equation."

How does it appear on a graph?

"Functions can either be constant, increasing as x increases, or decreasing as x increases."

4. Identifying the rate of change

Yes, you can:

"Consider the line y = 2x + 1, shown at the right. Notice that this slope will be the same if the points (1,3) and (2, 5) are used for the calculations. For straight lines, therate of change (slope) is constant (always the same). For every one unit that is moved on the x-axis, two units are moved on the y-axis."

5. Determining if it is a linear function or not

"A linear function is in the form y = mx + b or f(x) = mx + b, where m is the slope or rate of change and b is the y-intercept or where the graph of the line crosses the y axis. You will notice that this function is degree 1 meaning that the x variable has an exponent of 1."

THAT IS IT HOPE THIS HELPED ON YOUR REVIEW!!

-Jina Wang, from Middle School

12 X 13= 156 because 1 x 12 is 12 and 1 x 13 is 13 so then u multiply both of them together which will give 156