Exponential Functions:Key Features/Applications

The half-life of nitrogen is 10 minutes. If you start with 120 g, how much will be left after 50 minutes?

a=​ ​ (a)   b=​ ​ (b)   ​ x=​ (c)   h=​ (d)  

Amount of nitrogen left=​ (e)  

• 120
• 1/2
• 50
• 10
• 3.75
• 30
• .12
• 2.125

• y = -1

• y = -3

• y = -2

• x = -1

The cost of a party size bag of Doritos is $6. If the price increases an average of 7%

per year, what would be the price of a bag in 3 years?

• 32
• .91
• decay
• 9
• growth
• horizontal asymptote

• 625

• 241,484

• 12,500

• 6,250

A petri dish with E Coli bacteria starts with 10,000 cells and dies off at a rate of 12% every day. How many bacteria will be left after 21 days? (round to the nearest whole number)

• The rabbit population is decreasing over time

• The rabbit population started with 8 rabbits

• There will be 25 rabbits after 7 months

• The rabbit population is increasing by 8% each month

A scientist is studying the growth rate of a certain bacteria when it is starved of nutrients. The graph represents the number of bacteria (y) over time (x).

Every minute the number of bacteria is decreasing by approximately what percent?​ ​ ​ ​ (a)  

After the first 30 minutes, how many bacteria died off?​ (b)  

After 50 minutes, there was a total of how many bacteria?​ (c)  

What is the initial amount of bacteria?​ (d)  

• 3
• 30,000
• 10,000
• 80,000

• I, II, IV

• I, II, III, IV

• I, IV

• II, III