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Mathematics 11 Online
OpenStudy (anonymous):

PLEASE HELP (PICTURE BELOW)

OpenStudy (anonymous):

OpenStudy (anonymous):

S[3,8,5n] S[3,8,5n]=15+5(4)+5(5)+5(6)+5(7)+5(8) S[3,8,5n]=15+20+5(5)+5(6)+5(7)+5(8) S[3,8,5n]=15+20+25+5(6)+5(7)+5(8) S[3,8,5n]=15+20+25+30+5(7)+5(8) S[3,8,5n]=15+20+25+30+35+5(8) S[3,8,5n]=15+20+25+30+35+40 S[3,8,5n]=165

OpenStudy (anonymous):

Thanks a lot. So 165 is my answer

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