# Exponential Growth/Decay Word Problems

• Sep 17th 2007, 11:21 AM
Jeavus
Exponential Growth/Decay Word Problems
I have a few word problems I'm working on, a bit confused. If any help is given, I'd appreciate it. :)

7. To determine whether a pancreas is functioning normally, a tracer dye is injected. A normally functioning pancreas secrets 4% of the dye each minute. A doctor injects 0.50g of the dye. Twenty minutes later, 0.35g remain. If the pancreas were functioning normally, how much dye should remain?

I'll post the others later if I can't work through them.

Thanks again.
• Sep 17th 2007, 11:40 AM
Jeavus
I think I worked out #7.

Tell me if this is right:

Pancreas leaves 0.35g remaining.
Fv = Iv(%)^x
Fv = 0.50(0.96)^20
Fv = 0.221

Therefore, if the pancreas were functioning normally, 0.22g would remain.

Is this correct?
• Sep 17th 2007, 06:26 PM
Jhevon
Quote:

Originally Posted by Jeavus
I think I worked out #7.

Tell me if this is right:

Pancreas leaves 0.35g remaining.
Fv = Iv(%)^x
Fv = 0.50(0.96)^20
Fv = 0.221

Therefore, if the pancreas were functioning normally, 0.22g would remain.

Is this correct?

looks good to me