SOLUTION: A gardener makes a 10-row triangular planting with 40 plants in the front row,36 in the second row,32 in the third row,and so on.if the pattern is consistent,what is the total numb

Algebra ->  Sequences-and-series -> SOLUTION: A gardener makes a 10-row triangular planting with 40 plants in the front row,36 in the second row,32 in the third row,and so on.if the pattern is consistent,what is the total numb      Log On


   

Question 1119423: A gardener makes a 10-row triangular planting with 40 plants in the front row,36 in the second row,32 in the third row,and so on.if the pattern is consistent,what is the total number of plants in the garden?



Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
40%2B%2840-4%29%2B%2840-4%2A2%29%2B%2840-4%2A3%29+...%2840-4%2A%2810-1%29%29

Sum from index 1 to 10, 40%2B%28n-1%29%2A4.


First Term: 40
Tenth Term: 4

%2810%2F2%29%2840%2B4%29
5%2844%29

highlight%28220%29