Question

Me ajudem???? Matematica

Answer 1

11)
a) a1=a2-r
28=36-r
r=36-28
r=8

a8=a1+7r
a8=36+7.8
a8=36+56
a8=92

b)a19=a1+18r
a19=36+18.8
a19=36+144
a19=180

12) r=9 e a10=98

a)a10=a1+9r
98=a1+9.9
98=a1+81
a1=81-98
a1=17

b)an=a1+(n-1).r
an=17+(n-1).9
an=17+9n-9
an=9n+8