Let an denote the nth term of a geometric sequence. Let a0= 256 and an+1=0.5an Part A

Write an explicit formula for this sequence.
An=
Part B

To the nearest whole number, what is the sum of the first 25 terms?

the 1st digit is in the 100s n its 1

step-by-step explanation:

3,589÷18 = 199.389

so the first digit of the quotient is in the 100s n its 1

1. a^4+8a^3+24a^2+32a+16

2.y^8+8y^7+28y^6+56y^5+70y^4+56y^3+28y^2+8y+1

3.x^6-3x^4y^2+3x^2y^4-y^6