0

# College Algebra- Word Problem

Getting lost on this word problem ?

If 100 ml of anesthesia is injected into the local tissue at the time of the procedure (t = 0),

And the amount of anesthesia still in the tissue "t" hours after the injection is given by A = 100e–0.5t,

How much is in the tissue 7 hours later?

Round to two decimal places THANK YOU :-)

### 1 Answer by Expert Tutors

Ismael A. | Your Qualified and Motivated Math and Spanish tutor.Your Qualified and Motivated Math and Sp...
2
You may be getting lost because you may not understand the function itself the way you wrote it. It seems the correct function should be A = 100(e-0.5t). Check that is the correct function in your book/notes.

When you substitute t=0 into that function you get A=100 which is the initial amount of anesthesia in the tissue.

If you want to find the amount of anesthesia 7 hours later just substitute t=7 into that function to get the solution to the problem (you have to round it to two decimal places. You need to know the rounding rules).