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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 :-)

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Ismael A. | Your Qualified and Motivated Math and Spanish tutor.Your Qualified and Motivated Math and Sp...
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).