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September 21, 2014

September 21, 2014

Posted by **ELIJAH HAVA** on Sunday, April 28, 2013 at 2:36am.

2.A display of cans on a grocery shelf consists of 20 cans on the botton, 18 cans inthe next row, and so on in an arithmic sequence, until the to[p row has four cans. how many cans , in total, are in the display?

- maths -
**Reiny**, Sunday, April 28, 2013 at 5:53ama = 3x+1

d = 2x+6

term(6) = a + 5d

= 3x+1 + 5(2x+6)

= 13x + 31

2.

a = 20

d = -2

term(n) = 4

4 = a + (n-1)d

4 =20 - 2(n-1)

4 = 20 - 2n + 2

2n = 18

n = 9

sum(9) = (9/2)(first + last)

= (9/2)(20+4) = 108

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