jennifer-adams_6094e530e0355
jennifer-adams_6094e530e0355
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a1 = r a20 = a1+19r = - 100 a20 = r + 19r = - 100 20r = - 100 r = - 5 a1 = - 5 a20 = -5 + 19(-5) = -5 -95 = - 100 s20 ={( a1+an ) n } / 2 S20 = ( -5 - 100 )20/ 2 = -105(10) = - 1050