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A supermarket display consists of boxes of cereal. The bottom row has 23 boxes. Each row has three fewer boxes than the row below it. The display has six rows.

Write and use a function to determine how many boxes are in the top row. Show your work.

Use the appropriate formula to determine the number of boxes in the entire display. Show your work.

 

Answer:

adore.nuk  Mar 6, 2018
 #1
avatar+88871 
+3

The number of boxes on the top row  is

 

23   - 3 (6-1)   =  8 in the first row

 

To find the total sum  we have

 

[ Number in  first row + Number in last row ]  * rows / 2  =

 

 

[ 23 + 8 ] * 6 / 2  =       31 * 3   =  93 boxes in the entire display

 

 

 

cool cool cool

CPhill  Mar 6, 2018

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