Answer:
910
Step-by-step explanation:
65×14=910
After 12 hours the pound would have 720 pounds of algae.
Your options are all in the slope intercept format
which is
y = mx + b
where m is the slope
so for
A, your slope is -3
B, slope is 1 (?) [you made a typo]
C, slope if 6
D, slope is 2
the biggest number here is 6
therefore C has your steepest slope