Question

please answer:

1.Find an equation for the nth term of a geometric sequence where the second and fifth terms are -2 and 16, respectively.
answers:
an = 1 • (-2)^n - 1

an = 1 • 2^n

an = 1 • (-2)^n + 1

an = 1 • 2^n -1

2. Write the sum using summation notation, assuming the suggested pattern continues.
-1 + 2 + 5 + 8 + ... + 44

3. Find the sum of the geometric sequence.
4/3, 8/3, 16/3, 32/3, 64/3
answers:
122/3

124/3

124/15

122/15

Answer 1

can someone please help!