Question

done

Answer 1

since the terms are number an, then n is any integer from one onward. n>=1.

since a4 = a1*r^3,
1024r^3 = -16
r^3 = -16/1024 = -2^4/2^10 = -2^-6
So, r = -2^-2 = -1/4

a6 = a4*r^2 = -16 * 1/16 = -1

Answer 2

i tried -_- :(

Answer 3

thanks

Answer 4

got it?