12x^2 + x -12 I think . Good luck
Answer: 39
Step-by-step explanation: you have to plug in -4 into each x so that would be f(-4)=2(-4)(2)+7(-4)(3)-8(-4)(2)-21(-4)+7= 39
Answer:
C on Edge 2020
Step-by-step explanation:
The graph where the 60 degree angle is touching the y axis and air is above ground
Answer:
No
Step-by-step explanation:
40/10 = 4
10/40 = 0.25
Using the vertex of the quadratic equation, it is found that the maximum profit she can earn is of $106.
<h3>
What is the vertex of a quadratic equation?</h3>
A quadratic equation is modeled by:

The vertex is given by:

In which:


Considering the coefficient a, we have that:
- If a < 0, the vertex is a maximum point.
- If a > 0, the vertex is a minimum point.
In this problem, her profit is modeled by:

Which is a quadratic equation with coefficients a = -1, b = 14, c = 57, hence, her maximum profit in dollars is given by:

More can be learned about the vertex of a quadratic equation at brainly.com/question/24737967