SOLUTION: A brick wall is built with bottom row having 50 bricks. Each row on top of that is one less. The next is 49, then 48 and so on continuing on until the top row is just 1 brick. A

Question 891685: A brick wall is built with bottom row having 50 bricks. Each row on top of that is one less. The next is 49, then 48 and so on continuing on until the top row is just 1 brick. A) How can I write the total # of bricks as a summation?
Here's what I know. I know the answer is 1275 bricks. I know d=1. I tried sn=((n)(2a(sub1) + (n-1) d)) / 2. I tried solving with 50 plugged in for n and 1 in for 2a(sub1), and vice versa. I am 25 away from the correct answer. Just not sure of the placement of my numbers.
Thank you for any help you can give.
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Start at , end at .
When ,
When ,

.
.

RELATED QUESTIONS
A pile of bricks in the bottom row, 81 bricks in the second row, 77 bricks in the third... (answered by checkley77)

A monument is constructed by laying a row of 35 bricks at ground level. A second row,... (answered by stanbon)

a one wall tower has 4095 bricks , the top row has one brick each row below has one more... (answered by Alan3354)

I need more detail solution: A child has a bag full of little toy bricks each of... (answered by kjmugno,MathTherapy,milo1954)

A fireplace contains 46 bricks along its bottom row. If each row above decreases by 4... (answered by stanbon)

i do not understand this problem at all and i dont understand what im suppose to do on... (answered by richwmiller,solver91311)

Scott and Lauren are making a brick path in the school garden. Scott places 6 rows of... (answered by richard1234)

Can someone please walk me through this? Plastic pipe is stacked so that the bottom... (answered by Fombitz,solver91311,stanbon)

A stack of poles has 70 poles in the bottom row, 68 poles in the next row, and so on,... (answered by josgarithmetic,ikleyn)