Question

Pa (2,5,8,11...) calcule o 1° termo (a1) razao (r) 11° termo (an)

Answer 1

an=a1+(n-1).r
11=a1+4-1.3
11=a1+3.3
11=a1+9
11-9=a1
a1=2

r=a2-a1=5-2=3

an=a1+(n-1).r
a11=2+11-1.3
a11=2+10.3
a11=2+30
a11=32