Answer:
Choice A
Step-by-step explanation:
a=-6 (1st term)
ar= (2nd term)
ar^2= (3rd term)
ar^3 (4th term)
ar^4= (5th term)
ar^5=-1458 (6th term)
a=-6 so -6r^5=-1458
divide both sides by -6 giving r^5=243 so to obtain r you do the fifth root of 243 which is 3.
The common ratio is 3.
so ar=6(-3)=-18 (2nd term)
Only choice A fits this.
