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anonymous
 one year ago
What is the sum of the arithmetic sequence 3, 9, 15..., if there are 36 terms?
anonymous
 one year ago
What is the sum of the arithmetic sequence 3, 9, 15..., if there are 36 terms?

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welshfella
 one year ago
Best ResponseYou've already chosen the best response.1Sum of n terms = (n/2)[2a + d(n1)] where d = common difference and a = first term

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1common difference d = 9 3 = 6

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0right then what do I do?

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1well plug in the values n = 36, d = 6 and a = 3

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1plug these in and work it out

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1= (36/2)[2*3  6(361)]

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1sorry that should be a + before the 6 not 

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0you're all good so then I have to solve that?

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1do the parts in the parentheses first

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0(18)[35] is what I got but that doesn't seem like it makes sense at all

welshfella
 one year ago
Best ResponseYou've already chosen the best response.136/2 = 18 36  1 = 35

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1no thats not right its 18(6 + 6*35) do the stuff in the parentheses first then finall y multiply by 18

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1multiply 6 by 35 before adding the 6

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1no i think you are doing things in the wrong order remember PEDMAS Parentheses Exponent Division Multiplication Add Subtract thats the order of operations

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1yes 3888 is correct 18(6 + 6*35 = 18*(6 + 210) = 18 * 216 = 3888

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1PEDMAS is very important

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1note i worked out 6 + 210 before i multipilied by 18 because 6 + 210 was in the parentheses
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