Examples from the Exponentials Practice Quiz

 

1. Mr. Lee’s mom bought him a Dukes of Hazzard lunchbox in 1980 for $4.50.  In 2006, this lunchbox sells on eBay for $48.75. 

a)  Assuming the value of this lunchbox grows exponentially, write an equation for its value.

b)  How much will Mr. Lee’s lunchbox be worth in 5 more years (in 2011)?              

c)  In what year will Mr. Lee’s lunchbox be worth $60?

Correct Solutions:

 a)

 

Note: answers should be in sentence format for part b) and c)

b)

 

c)   

This is not correct...  .  The questions asks "in what year?" not "how many years?"

 

 

2a)

Incorrect Examples:

   

Correct!

2b)

Incorrect Examples

           

 

Correct but not a proper format.                       A nice solution but not accurate enough.

(It’s half fraction, half decimal?)

                                   

Correctish!  (I’d rather see the fraction 7/8 but I’ll take 0.875)

3a)

Incorrect Examples

     

 

Correct!

3b)

Incorrect Examples                                                      

                    

 

Correct Answer but Sloppy Work                                Correct!

                       

 

 

 

4a)

Correct Answers: 1        

Order of Operations Mistakes: 9

Exponential Rules Mistakes:  2                

Blank or incomplete answers: 22  (this was one of the last questions... was there not enough time?)

 

Incorrect Examples

              

 

Correct!

 

4b) Correct! (but where's your work?)          Not so much...  (rounding error)