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tensa zangetsu [6.8K]
3 years ago
8

I NEED HELP PLEASE THANKS! :) Find the seventh partial sum of 13, 22, 31, 40, ...

Mathematics
2 answers:
Harrizon [31]3 years ago
7 0

Answer:

Step-by-step explanation:

Arithmetic sequence

First term a = 13

Common difference = 2nd term - first term

                                 = 22 - 13

                             d = 9

a_{n}= a + (n-1)d\\\\a_{7}= 13 + 6*9

   = 13 + 54

  = 67

Sum of 7 terms = \frac{n}{2}(2a + (n-1)d)\\\\

                         = \frac{7}{2}(2*13+6*9)\\

                         =\frac{7}{2}(26+54)\\

                          = \frac{7}{2}*80\\

                         = 7 *40

                          = 280

Olin [163]3 years ago
5 0

Answer:

280

Step-by-step explanation:

the 7th number is

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