Exponent Pre-Quiz

The number of bacteria in a Petri dish double every month. If the dish started with 1,800 bacteria, how many will there be in ten months? Justify your answer mathematically.

• 1843200

• 7.1409x10^32

• 921600

• 3686400

Sam deposits $250 in an account that pays 6% interest annually. She makes no other deposits or withdrawals. Which equation can be used to calculate the amount, A, in Sam’s account for any year, n?

• $A\left(n\right)=250\left(6\right)^n$

• $A\left(n\right)=250\left(1.6\right)^n$

• $A\left(n\right)=1.06\left(250\right)^x$

• $A\left(n\right)=250\left(1.06\right)^x$

Is the equation $A=1500\left(1-0.18\right)^t$  a model of exponential growth or exponential decay, and what is the rate (percent) of change per time period?

• Exponential growth, 18%

• Exponential growth, 82%

• Exponential decay, 18%

• Exponential decay, 82%

Identify the y-intercept (initial value) of the function f(x)=2(4)^x.

• 2
• 4
• (2)^x
• 8

Tags

CCSS.HSF.IF.B.4

CCSS.HSF.IF.C.7

CCSS.HSF.LE.B.5

In an exponential function, what does the 'a' represent? 

• SLOPE
• RATE OF CHANGE
• Y-INTERCEPT
• COMMON RATIO

Tags

CCSS.HSF.LE.A.1

CCSS.HSF.LE.B.5

Identify the common ratio (multiplier) of the function f(x)=2(4)^x.

• 2
• 4
• (2)^x
• 8

Tags

CCSS.HSF.LE.A.1

CCSS.HSF.LE.B.5

Is the following function and example of decay or growth?

f(x)=2(0.85)^x

• Exponential Decay

• Exponential Growth

Tags

CCSS.HSF.LE.A.3

CCSS.HSF.LE.B.5

Which of the following is an increasing exponential function whose y-intercept is 50?

• y = 50(.05)^x
• y = 50x - 4
• y = (2)^x + 50
• y = 50(1.4)^x

Tags

CCSS.HSF.BF.A.1

CCSS.HSF.IF.A.1

CCSS.HSF.LE.A.1

CCSS.HSF.LE.A.2

CCSS.HSF.LE.B.5

Classify the function, f(x) = 6.5(0.85)^x.

• exponential growth
• exponential decay
• positive linear
• negative linear

Tags

CCSS.HSF.LE.A.1

CCSS.HSF.LE.B.5

How do you write 5% as a decimal?

• 50
• 5
• 0.5
• 0.05

Tags

CCSS.4.NF.C.5

CCSS.4.NF.C.6