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?

Where m is the slope of the line and b is the y-intercept of the line, or the y-coordinate of the point at which the line crosses the y-axis. to write an equation in slope-intercept form, given a graph of that equation, pick two points on the line and use them to find the slope. this is the value of m in the equation.