Question

sabendo que numa pa an=44,al=4 e r=5 determine o n

Answer 1

a 1 = 4
r = 5
a n = 44
a n = a 1 + (n - 1).r
44 = 4 + (n - 1 ).5
44 - 4 = -5 + 5 n
40 = -5 + 5 n
40 + 5 = 5 n
45 = 5n
5 n = 45
n = 45/5
n = 9