Answer:
$1.24
Step-by-step explanation:
4.48/4=1.24
1.30 represents the rate of growth of the mold spores. This decimal is a representation of the percentage growth, which would be 130%.
Since the function is written in terms of weeks, x will equal 4 to represent the amount of spores after 4 weeks. Plug the value into the function:

Rounded to the nearest ones value, there will be 985 mold spores after 4 weeks.
Answer:
31.42
Step-by-step explanation:
S1=-1
S2=-4
S3=-9
S4=-16
....
Sn=-n^2
...
S20=-20^2=-400