5) A substance decays 22% each day. After 7 days, there are 9 milligrams of the substance remaining. How many milligrams were there initially?

College Algebra
1st Edition
ISBN:9781938168383
Author:Jay Abramson
Publisher:Jay Abramson
Chapter6: Exponential And Logarithmic Functions
Section6.1: Exponential Functions
Problem 68SE: An investment account with an annual interest rateof 7 was opened with an initial deposit of 4,000...
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5) A substance decays 22% each day. After 7 days, there are 9 milligrams of the substance remaining.
How many milligrams were there initially?
6) Sam opened a bank account with an interest rate of 4.8% that is compounded annually. He invested
$3,890 in the account in 1999 but had to make a withdrawal from his account in 2007 in the amount
of $2,300 with no penalty. How much money is in his account now, in 2016?
Transcribed Image Text:5) A substance decays 22% each day. After 7 days, there are 9 milligrams of the substance remaining. How many milligrams were there initially? 6) Sam opened a bank account with an interest rate of 4.8% that is compounded annually. He invested $3,890 in the account in 1999 but had to make a withdrawal from his account in 2007 in the amount of $2,300 with no penalty. How much money is in his account now, in 2016?
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