Winston G.

asked • 11/30/16

Word Problem - College Algebra

Totally Lost with this word Problem.
 
 
When a person has a cavity filled, the dentist typically gives a local anesthetic. After leaving the dentist's office, one's mouth often is numb for several more hours. 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 local tissue t hours after the initial injection is given by A = 100e–0.5t, how much is in the local tissue 7 hours later?
 
Round to two decimal places

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Mark M. answered • 11/30/16

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A = 100e-0.5t
A = 100e-0.5(7)            this for 7 hours
 
Can you calculate?
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Winston G.

Not to sure how to approach it Mark.
 
The formula I am using is quite confusing.
 
Would I factor out the raised powers?
 
Thank You
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12/01/16

Mark M.

Winston, need to use a calculator.
A = 100e-0.5(7)
A = 100e3.5
On calculator locate key ex. Tap, enter 3.5. You should get something like 33.11545.
Now multiply by 100.
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12/01/16

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