write explicit formulas for each of the following sequences:

1, 4, 9, 16, . .

3, -1, -3, -5, . .

1, 7, 25, 79, 241, . .

1.  this is a series of squares  Formula is an = n^2

2. Arithmetic series with common difference d = -2.

an = a1 + (n-1)d  = 3 -2(n-1)

Cant see the rule for Number 3

Ab=dc ac=de ad=bce i hope this !