Question

ESCREVA A PA DE  numa pa de 14 termo a1 =2 an28 calcule sua razao

Answer 1

 Formula            
an=a1+(n-1).r
n=14
an= 28
a1=2

an = a1 + ( n - 1 ) . r
28 = 2 + ( 14 - 1 ) . r
26 = 13r
r = 2

Answer 2

 n=14
a1 =2
an28
r=?

a14= a1 + (n-1).R
28 = 2 + (14-1)R
28=2+13R
13R = 28 - 2

13R=26
R=26/13

R=2