Enter a recursive rule for the geometric sequence. 3, −12, 48, −192, 

  a[1] = 3; a[n] = -4a[n-1]

Step-by-step explanation:

The first term is 3, so that is the first part of the recursive rule: a[1] = 3.

Each term is -4 times the previous term, so that is the second part of the recursive rule: a[n] = -4a[n-1].

You know a geometric sequence has a common ratio. That ratio can be found by dividing any term by the one before: -12/3 = -4. This is the value that each term is multiplied by to get the next term.

for b its (t) and c its (d)

step-by-step explanation:

correct answer:

i^31 = -i