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March 3, 2015

March 3, 2015

Posted by **Anonymous** on Sunday, February 21, 2010 at 8:00am.

b) the total number of bricks in the wall

- maths -
**Anonymous**, Sunday, February 21, 2010 at 9:35ami need to know how to do this one please

- maths -
**Reiny**, Sunday, February 21, 2010 at 9:51amlet a = 4

we know d = 2

S_{m}= m/2[8 + (m-1)(2)]

21m + 40 = m[3+m]

take over, (I got m=20)

Once you have m, sub into 21m+40 for the sum.

- maths -
**Anonymous**, Sunday, February 21, 2010 at 10:13amthx alot

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