3 is odd
So by the question he will lose 10 times the number that comes up
3*10=-30
The quadratic equation that best represents his model of the relationship between stock value and time is given by:

The graph is given at the end of the answer.
<h3>What is the equation of a parabola given it’s vertex?</h3>
The equation of a quadratic function, of vertex (h,k), is given by:

In which a is the leading coefficient.
In this problem, the maximum value was a share value of $18 after 10 days, hence the vertex is:
(h,k) = (10,18).
Thus:

Since the initial price was of $8 per share, we have that:




Hence the equation is:

At the end of the answer, the sketch of the graph is given.
More can be learned about quadratic equations at brainly.com/question/24737967
Answer:
B
Step-by-step explanation:
Hope the picture helps!
Answer:
d = 6
Step-by-step explanation:
10 - d = 34 - 5d
add d to both sides to make all the d's on one side
10 = 34 - 4d
subtract 34 from both sides to isolate the d and its coefficient
-24 = -4d
divide both sides by -4 to isolate d
d = 6