Asample of bacteria is decaying according to a half-life model. if the sample begins with 80 bacteria and after 10 hours or 20 bacteria, what is the approximate half life and hours round to the nearest integer.

5 hours

Step-by-step explanation:

After 10 hours, the number of bacteria drops from 80 to 20.  That's a factor of ¼, so 2 half lives must have passed (½ × ½ = ¼).  If 10 hours equals 2 half lives, then 1 half life is 5 hours.

We can show this with the half life equation:

A = A₀ (½)^(t / T)

20 = 80 (½)^(10 / T)

¼ = (½)^(10 / T)

10 / T = 2

T = 5

question

what is the value of the third quartile of the data set represented by this box plot? a. 19 b. 21 c. 26 d. 29

answer

c

17

step-by-step explanation: