I believe it is positive so option 2
<span>Cost 1 pack = x
3x + 10 = 5x
2x = 10
x = 5
1 pack cost $5
Hope this helped</span>
29.

As
,
.
This can be easily verified by looking at the graph (graph of a quadratic equation).
30.
The growth of a population is not linear, it's exponential.
31.
Exponential growth > polynomial, so
.
35.

The question is asking V(t) for t = 40.

36.
The point of symmetry of a quadratic equation
is at its vertice:



The line is x= 3.
Algebra is really easy when you try your hardest. What seems to be troubling you friend?