The concentration C C (in mg/cc) of a particular drug in a person's bloodstream is related to the time t t (in hours) after injection in such a way that as t t changes from 0 0 to 8 8, C C changes from 0.9 0.9 to 0.1 0.1. Find the average rate of change of C C with respect to t t.

The average rate of change of 'C' with 't' is -0.1. Negative sign means there is decrease in concentration with time.

Step-by-step explanation:

Given:

Initial concentration (C₁) = 0.9

Final concentration (C₂) = 0.1

Starting time (t₁) = 0

End time (t₂) = 8

Now, change in concentration is equal to the difference of final and initial concentration. Therefore,

Change in time interval is given as:

Average rate of change of concentration 'C' with time 't' is given as:

Therefore, the average rate of change of 'C' with 't' is -0.1. Negative sign means there is decrease in concentration with time.

the best buy, is the 4- kilogram bag of lollipops for $18.40.

step-by-step explanation:

i found my answer by dividing the cost of each bag by their respective weights.

14.88 divided by 2 = 7.44

17.29 divided by 3 = 5.77

18.4 divided by 4 = 4.6

24.4 divided by 5 = 4.88

by this, i found that the 4 kilo bag is the best buy.

x = -4

step-by-step explanation:

- 20 - 4(x + 3) = 4x

=> -20 - 4x - 12 = 4x

=> - 32 -4x = 4x

=> -32 = 4x + 4x

=> - 32 = 8x

=> -32/8 = x

=> -4 = x