2n-3/6 Find the common ratio and write out the first four terms of the geometric sequence

Common ratio is a)
b) A1=
, c)A2 =
d)a3 =
e) a4 =

Fiona races bmx around a circular dirt course. if the radius of the course is 70 meters, what is the total distance fiona covers in two laps of the race? a. about 30,772 meters b. about 15,386 meters c. about 879.2 meters d. about 439.6 meters e. about 219.8 meters23 points hurry

How is working backward similar to solving an equation?

Can someone factor this fully? my friend and i have two different answers and i would like to know if either of them is right. you in advance. a^2 - b^2 + 25 + 10a