Question

calcule o 10° termo da P.G (9,27...)

Answer 1

an = a1+(n-1).r
r = 27-9
r = 18
n = 10
an = 9+(10-1).18
an = 9+9.18
an = 9+162
an = 171

Answer 2

an=a1*Q^n-1
a10 =9*(27/9)^10-1
a10 = 9(3)^9
a10 = 177147