Question

numa PA a1= -3 e r=5, calcule o vigésimo termo

Answer 1

an= a1+(n-1).r
a20= -3 + (20-1) . 5
a20= -3 + 19 . 5
a20= -3 + 95
a20= 92
vigésimo termo= 92

Answer 2

a1=-3 r=5 n=20 an=? an = a1 + (n - 1). r an = - 3 + (20 - 1). 5 an = - 3 + (19).5 an = - 3 + 95 an = 92