<u>Answer:</u>
<em> -41r - 16</em>
<u>Step-by-step explanation:</u>
<em>Step 1 :</em>
<em>Step 2 :</em>
<em>Pulling out like terms :</em>
<em> 2.1 Pull out like factors :</em>
<em> -5r - 2 = -1 • (5r + 2) </em>
<em>Equation at the end of step 2 :</em>
<em> -r + -8 • (5r + 2)</em>
<em>Step 3 :</em>
<em>Step 4 :</em>
<em>Pulling out like terms :</em>
<em> 4.1 Pull out like factors :</em>
<em> -41r - 16 = -1 • (41r + 16) </em>
10 is the answer
explanation. Find the volume and multiply that by 2
the doubled volume is 10
Using it's vertex, the maximum value of the quadratic function is -3.19.
<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, the equation is:
y + 4 = -x² + 1.8x
In standard format:
y = -x² + 1.8x - 4.
The coefficients are a = -1 < 0, b = 1.8, c = -4, hence the maximum value is:

More can be learned about the vertex of a quadratic function at brainly.com/question/24737967
#SPJ1