Answer:
Eric's expression is :

and Andrea's is :

In Eric's expression, 20 represents the initial amount of substance with which he has started the experiment.
is the amount of substance left after each time period (in this case, each week).The variable w in this case represents the number of weeks.
Andrea's expression can be written as :

The one outside of parentheses represents the initial amount of the substance. The one inside of parentheses represents 100% of the original amount of the substance. 0.5 represents the 50% of the substance that is lost each time period. The variable w in this case represents the number of weeks.
The answer would be A, complementary angles must add up to 90 degrees
Answer:
Exponential functions
Step-by-step explanation:
:D
Step-by-step explanation:
1/50 is the answer for 2 percent as a fraction in simplest form.