Question

quantos termos tem a pa (4,9,14,........59)

Answer 1

(4,9,14,19,24,29,34,39,44,49,54,59) São No total 12 Termos :)

Answer 2

a1=4
a2=9
razão=9-4=5
an=59


an=a1+(n-1).r
59=4+(n-1).5
59=4+(n-1).5
59=4+5n-5
59-4+5=5n
n=60/5
n=12