Question

find a30-a20 for the ap -9, -14, -19, -24

Answer 1

Hey♥️

AP : -9, -14, -19, -24....

a= -9

d= 5

an= a + (n - 1)d

a30= -9 + (30 - 1)5

a30= -9 + (29)5

a30= -9 + 145

a30= 136

a20= -9 +(20 - 1)5

a20= -9 +(19)5

a20=86

a30 - a20

= 136 - 86

= 50