<h2>Part 1)</h2>
Let's analyze each part of the function:
FROM x = 0 TO x = 5:
We can find the equation of this line by using The Slope-Intercept Form of the Equation of a Line, that states:

So the y-intercept here is
and
, therefore:

FROM x = 0 TO x = 5:
From the previous line, we know that at
the output is:

So the point
lies on both lines.
For this new line, the slope is
So, with the Point-Slope Form of the Equation of a Line we can find the equation of this other line:

So:

The graph is shown below.
<h2>Part 2)</h2>
The graph of the linear function
is a line with slope
and
at
. From the items, we can assure that the following equations are linear functions:

In conclusion, the other functions are nonlinear and they are:

The answer is 19. You have to do 1/4 x 76/1 which is basically 76 divided by 4, which gives you 19.
Binomial theorem:

The term with

corresponds to

and

(or

, since

).
So, the coefficient of this term is
Y=7x+1
*note that the first number is always the x.
so,
a) (0,?)
y=7(0)+1
y=1
(0,1)
b) (3,?)
y=7(3)+1
y=21+1
y=22
(3,22)