In a geometric series
If a1=6 and r=5 find s9

I have no idea how to solve that but can you teach me how !

i think it's ф or x=6,-6

step-by-step explanation:

-x^2=-36

x^2=-36

ф

or

if you mean by : -(x^2)=-36

it'll be: x^2=36

x=6,x=-6

hope it'll ! have a good day!

you for asking!

none of these

step-by-step explanation:

23 + 34 add up to 57 so just inform the teacher of this really stupid mistake