What is the probability of the following.

(a) an event a that is certain to occur?
1

(b) an event b that is impossible?
2

Classify the following triangle check all that apply

Apatient is given 50 mg dose of medicine the medicines effectiveness decreases every hour at a constant rate of 40% what is the exponential decay function that models this scenario how much medicine will be left in the patients system after 2 hours

What is the standard deviation of the following data set rounded to the nearest tenth? 3, 17, 18, 15, 12, 21, 9