Question

When finding the sum of the arithmetic sequence 4 + 1 + -2 + -5 + -8 + -11, you will have a step of work that contains the number -3. Describe how the -3 was calculated and what it means.

Answer 1

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Answer 2

common difference =-3
Sum of AS = (first term + last term)(no. of terms) /2
first term =4
last term =-11
number of terms=x
4-(-11) = (-3)x
x=5
therefore, there is 4 minus 3 five times to reach -11
som there is six terms

Sum of AS
=(4-11)(6)/2
=-21

Answer 3

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