Answer:
A) The expression is given by .
B) The remaining butterflies after Ellen captures 7 butterflies is 41.
Step-by-step explanation:
A) As the number of butterflies keeps doubling every minute so the repeating number is 2 thus we use the term where n given the number of minutes passed.
Initially there were 3 butterflies on the screen so we multiply the term with the initial number of butterflies
. So the expression becomes:
B) After 4 minutes Ellen captures 7 butterflies from the total, So we subtract the term 7 from the number of butterflies we calculated through the expression.
So, after 4 minutes
As Ellen has captured 7 butterflies, So: