Answer:
It's linear
Step-by-step explanation:
This is a slope intercept form.
You should divide sand if the number isn’t whole round it
Omar has the grater rate of change
Let the additional fee , the shipping company charges be $y .
So for 0.75 pounds, since the weight is less then 1 pound, company charge = $2x
For 3 packages with weigh 2.5 pounds, company charge 3* ( x+(2.5-1)*y )
= 3x+4.5y
For package with weighs 4.2 pounds, company charge x+(4.2-1)y = x+3.1y
So the total amount , company charge = 2x +3x +4.5y +x+3.1y
=6x +7.6y
In this problem, it will be helpful to know the vertex form of a parabola, which is listed below:
is a constant which helps to determine whether the parabola opens up or down. If 
, then the parabola opens downward and if 
, the parabola opens upwards
is the vertex of the parabola
By looking at the graph, we can first see that the graph opens downwards, meaning that . Thus, choices C and D are not valid. Now, let's use the vertex of the parabola to complete the equation.
The vertex of this parabola is (-1, 3), as shown by the graph. When we substitute this into our formula, we get:
The answer is a, 
.
