Review CFA 5.3

Maggie bought a Kobe Bryant jersey. The value of the jersey, in dollars, can be modeled by the following function, where x is the number of years that have passed since Maggie bought the jersey.

What does the number 250 represent in the function?

• the amount of value of the jersey increases each year

• the rate at which the value of the jersey increases

• the value of the jersey when Maggie bought it

• the value of the jersey one year after Maggie bought it

A scientist is studying bacteria and records the number of bacteria over time. The scientist determines that the function listed models the number of bacteria, N, after t hours.

What is the number of original bacteria?

• 1.45

• 400

• 45

• 145

A scientist is studying bacteria and records the number of bacteria over time. The scientist determines that the function listed models that number of bacteria, N, after t hours.

What is the percent of increase every hour?

• 400

• 145%

• 1.45%

• 45%

Consider the function for cell duplication. The cells triple every minute. What do the value of 80 and 3 represent in relation to the duplication of cells?

• The 80 is the initial number of cells, and the 3 indicates that the number of cells increases by 3 every minute.

• The 80 is the initial number of cells, and the 3 indicates that the number of cells triples every minute.

• The 80 is the number of cells at 1 minute and the 3 indicates that the number of cells triples every minute.

• The 80 is the number of cells at 1 minute, and the 3 indicates that the number of cells increases by 3 every minute.

A Camaro was purchased for $70,500. The value of the car depreciates at a rate 3% per year. Which equations would model this situation? CHOOSE TWO.

• C = 70500 (0.03)^t

• C = 70500 (1.03)^t

• C = 70500 (0.97)^t

• C = 70500 (1+0.03)^t

• C = 70500 ( 1 - 0.03)

The number of ants in a certain county is changing according to the function listed, where t = time in years and f(t) = ant population in millions. Which statement describes this situation?

• The ant population is increasing by 2% per year.

• The ant population is decreasing by 98% per year.

• The ant population is increasing by 98% per year.

• The ant population is decreasing by 2% per year.

Mrs. Potts has a savings account. The total amount of money, in dollars, in the account in relation to the time, in years Mrs. Potts made her first deposit can be described by the equation:

What is the initial deposit?

• 5000

• 1

• 0.06

• 1.06

Mrs. Potts has a savings account. The total amount of money, in dollars, in the account in relation to the time, in years Mrs. Potts made her first deposit can be described by the equation:

What is the growth factor for the equation?

• 5000

• (1 + 0.06)

• t

• 0.06

Mrs. Potts has a savings account. The total amount of money, in dollars, in the account in relation to the time, in years, since Mrs. Potts made her first deposit can be described by the equation:

What is the interest rate?

• 5000

• 1

• t

• 0.06

Shannon counts 8 roses in her garden on the first day of Spring. The population increases throughout the season at a rate of 25% every week. What is the population after 12 weeks?

• 1 rose

• 117 roses

• 5 roses

• 125 roses