A flea jumps ft, then ft, then 1/8 ft, and so on. It always jumps

A flea jumps ½ ft, then ¼ ft, then 1/8 ft, and so on. It always jumps to the right.
a. Do the jump lengths form an arithmetic or geometric sequence?
What is the common difference or common ratio?
b. How long is the flea's eighth jump, and how far is the flea from its starting point?
c. How long is the flea's 20th jump? Where is it after 20 jumps?
d. Write explicit formulas for jump length and the flea's location for any jump.
e. To what point is the flea zooming in?