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Help #3

NotSoSmart  Mar 12, 2018

Best Answer 

 #1
avatar+12266 
+1

Arithmetic sequence with d = 18

26 + 44 + 62 + 80 + 98 + 116 + 134  =        ad 'em up to see what you get !

 

Or use     SUM =  n ( a1+a7)/2  =    7 (26+134)/2 = ??

 

4.)  d = 5  so 5n is good..... first one starts with 54 ...no good    second choice only has 13 terms...no good

           third choice  starts with 49 and has 5n and has 14 terms.....goood!     Fourth choice has 44 terms....no good

 

5.

n =1         = 5

    2           =6

    3             7

    4             8         Add 5   6  7   8   and you get ? 

ElectricPavlov  Mar 12, 2018
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2+0 Answers

 #1
avatar+12266 
+1
Best Answer

Arithmetic sequence with d = 18

26 + 44 + 62 + 80 + 98 + 116 + 134  =        ad 'em up to see what you get !

 

Or use     SUM =  n ( a1+a7)/2  =    7 (26+134)/2 = ??

 

4.)  d = 5  so 5n is good..... first one starts with 54 ...no good    second choice only has 13 terms...no good

           third choice  starts with 49 and has 5n and has 14 terms.....goood!     Fourth choice has 44 terms....no good

 

5.

n =1         = 5

    2           =6

    3             7

    4             8         Add 5   6  7   8   and you get ? 

ElectricPavlov  Mar 12, 2018
 #2
avatar+86528 
+1

3.

 

Note NSS  that the distances  are  26, 44, 62, 80.....  each successive term is 18 more than the succeeding one

 

The 7th term  is

 

26 +  18 ( 7 - 1)   =   26 + 18 * 6   =  134

 

For an arithmetic sequence.....the sum is given by :

 

 ( First term + Last term ) *  number of terms / 2  =

 

(26 + 134) * 7 /2    =   160 * 7 / 2   =  160 / 2 * 7   =  80 * 7  =  560 ft

 

 

 

EP's  answer to the second one is good

 

And for his third answer     5 + 6 + 7 + 8  =

 

[ 5 + 8] * 4 / 2   =   13 * 2    = 26  

 

 

cool cool cool

CPhill  Mar 12, 2018

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