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katiebugg
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The third term of an arithmetic sequence is 9 and the seventh term is 31. Find the sum of the first twentytwo terms.
 one year ago
 one year ago
katiebugg Group Title
The third term of an arithmetic sequence is 9 and the seventh term is 31. Find the sum of the first twentytwo terms.
 one year ago
 one year ago

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helder_edwin Group TitleBest ResponseYou've already chosen the best response.0
an arithmetic sequence is of the form \[ \large a_1\qquad\text{not given} \] \[ \large a_2=a_1+d \] \[ \large 9=a_3=a_2+d=a_1+2d \] so \[ \large 31=a_7=a_1+6d \]
 one year ago

helder_edwin Group TitleBest ResponseYou've already chosen the best response.0
u end up with \[ \large 9=a_1+2d \] \[ \large 31=a_1+6d \] solve this system
 one year ago

helder_edwin Group TitleBest ResponseYou've already chosen the best response.0
r u there @katiebugg ?
 one year ago

katiebugg Group TitleBest ResponseYou've already chosen the best response.0
sorry yeahh was working on a prob thanks!!!
 one year ago
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