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728= (a1 + 63)/2 * 16
45.5= (a1 + 63)/2
91=a1+ 63
a1=28
b) 2241=(18 + an)/2 *27
83=(18 + an)/2
166=18 + an
148=an
c) Sn= (2a1 + (n-1)*r/2 *n
518=(100 +13)*r/2 * 14
37=(100+13r)/2
74=100+13r
r= -2