a= -18.9 d=2.5 n=?am = 3.6
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a= -18.9 d= 2.5 an = 3.6
an = a+(n-1)d
3.6= -18.9 + (n-1) 2.5
3.6+18.9= 22.5 = (n-1) 2.5
22.5\2.5= n-1
9= n-1
n= 9+1
n = 10.
an = a+(n-1)d
3.6= -18.9 + (n-1) 2.5
3.6+18.9= 22.5 = (n-1) 2.5
22.5\2.5= n-1
9= n-1
n= 9+1
n = 10.
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