9t - 3t + 4
= 6t + 4
(hence 9-3)
you can do this due to the t being the same unit (classified as a like term). if it were 9t - 3g + 4, it would have to stay the same.
16 x8 will be the new lenth!
Solution:
First i'm going to divide the graph into 3 parts. Linear, Quadratic and Horizontal graph.
<u>Linear:</u>

<u>Quadratic:</u>

<u>Horizontal:</u>

Answer:

<em>Hope this was helpful.</em>
32 copies - 1 min - 60 seconds
176 copies - t
32 * t = = 176 * 60 seconds
t = 176 * 60 / 32 = 330 seconds