Writing Linear Equations

Writing Linear Equations

Multiple Choice

Is the exponential function growth or decay?

y = 7(1.25)^x

• Exponential Growth

• Exponential Decay

• None of the above

Multiple Choice

Is the exponential function growth or decay?

y = 7(.5)^x

• Exponential Growth

• Exponential Decay

• None of the above

Multiple Choice

Vanessa invested $2500 into an account that will increase in value by 3.5% each year. What is the value of a and r?

• a=2500

  r=3.5

• a=2500

  r=.035

• a=3500

  r=.35

• a=2500

  r=.35

Multiple Choice

Vanessa invested $2500 into an account that will increase in value by 3.5% each year. Write an equation to model the situation.

• $f\left(t\right)=2500\left(1+3.5\right)^t$
  

• $f\left(t\right)=2500\left(1-.035\right)^t$
  

• $f\left(t\right)=2500\left(1+.035\right)^t$

Multiple Choice

Vanessa invested $2500 into an account that will increase in value by 3.5% each year. What is the value of the investment after 20 years? $f\left(t\right)=2500\left(1+.035\right)^t$  

•  $f\left(20\right)=\text{4974.47}$ 
  

•  $f\left(20\right)=\text{}\text{1,010,683.97}$ 
  

•  $f\left(20\right)=248.72$ 

Multiple Choice

The flu has infected 400 people in the town and is spreading at 25% more people each day. Write an exponential function to model this situation.

• $f\left(t\right)=400\left(1-.25\right)^t$

• $f\left(x\right)=25\left(1+400\right)^t$

• $f\left(x\right)=400\left(1+.25\right)^t$

Multiple Choice

The flu has infected 400 people in the town and is spreading at 25% more people each day. Find the number of people who will be infected in 10 days.  $f\left(t\right)=400\left(1+.25\right)^t$  

•  $3726\ people$ 

•  $425\ people$  

•  $450\ people$ 

Multiple Choice

Ms Emerton bought at brand new car in 2012 for $28,750. If the car depreciates by 12% each year, write an exponential function to model the situation.

•  $f\left(t\right)=28,750\left(1-12\right)^t$  

•  $f\left(t\right)=28,750\left(1+.12\right)^t$  

•  $f\left(t\right)=28,750\left(1-.12\right)^t$  

Multiple Choice

Ms Emerton bought at brand new car in 2012 for $28,750. If the car depreciates by 12% each year, find the cars value in 2018.

•  $13,351.62$  

•  $14,528$  

•  $14,258.25$