Jawabanmu

2014-02-06T20:42:11+07:00
Beda= u2-u1 = 37-40 = -7
U45 = a+(n-1)b
U45 = 40+(45-1)-7
U45 = 40+(44)-7
U45 = 40+(-308)
U45 = 40-308
U45 = -268
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2014-02-06T20:49:24+07:00
A = 40
b = 37 - 28
   = 3
n = 45

Un = a + (n-1)b ---> ini rumus

U45 = 40 + (45-1)3
       = 40 + (44)3
       = 40 + 132
       = 172



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