Explicación paso a paso:
1). an = A1 + (n-1)d
an = 2. +(n-1)7
an = 2+7n -7
an = 7n -5
2) a30= 1 +(30-1)2
a30= 1 +(58)
a30 = 59
a30 = 2+(30-1)2
a30 = 2+58
a30= 60 R). a) 59 y 60
3)an = 72+(n-1)6
an = 72+6n -6
an = 6n +66
4) N = an - A1 / r +1
N= 125-425. + 1/-5
N= -300/-5 + 1
N= 61
R) a ) 61
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Explicación paso a paso:
1). an = A1 + (n-1)d
an = 2. +(n-1)7
an = 2+7n -7
an = 7n -5
2) a30= 1 +(30-1)2
a30= 1 +(58)
a30 = 59
a30 = 2+(30-1)2
a30 = 2+58
a30= 60 R). a) 59 y 60
3)an = 72+(n-1)6
an = 72+6n -6
an = 6n +66
4) N = an - A1 / r +1
N= 125-425. + 1/-5
N= -300/-5 + 1
N= 61
R) a ) 61