After a certain medicine is ingested, its concentration in the bloodstream changes over time.
The relationship between the elapsed time, t, in minutes, since the medicine was ingested, and its
concentration in the bloodstream, Chminute (t), in mg L, is modeled by the following function:
Cminute (t) = 61 - (0.96)
Complete the following sentence about the hourly rate of change in the medicine concentration.
Round your answer to two decimal places.
Every hour the medicine concentration decays by a factor of

First, think of what you know. you know that the number t the end of the equation will need to be subtracted because it is the money he lost from buying the lawn mower. and your first two weeks have negative profit, so that tells you that c and d are wrong. now you can plug any of the weeks into a and b to see which one works. i'll start with plugging week 1 into a.this isn't right because it says your answer for week one should be -90.so now we need to try the same thing with b.this one got you the right answer, (sometimes if you only check with one of the weeks multiple will work so you need to check with more of the weeks, but it worked out fine here)this means that b is the correct answer.let me know if you need more clarification. i hope this : )

Is a for each hour he works,his earnings go up by $4