Question

The manager of a store is stacking boxes for a display. There are 18 boxes on the bottom row. Each successive row has one less box than the previous row. The expression mc015-1.jpg represents the total number of boxes in the display for the first 15 rows. How many boxes are in the display? 18 22 165 330

Answer 1

So you start with 23
for every row up you have -3
equation is
# of boxes= 23- 3x
x representing the number of rows above the bottom
# of boxes= 23- 3x=
23-3(5)= 8 
5 for the top row
bottom row has 23
1 row above 23-3(x)=20
2 row above 23-3(x)= 17
3....23-3(x)= 14
4....23-3(x)=11
5...23-3(x)= 8
therefore just add all boxes each row has
23+20+17+14+11+8= 83 
I hope this helps

Answer 2

the answer is 165 just took the test