precalculus 12 grade

Question

KAMRYN GOT SOME HELIUM BALOON FROM HER BEST FRIEND RUT ON HER BIRTHDAY.THE BALLONS LOSE ONE -FIFTH ON THE HELIUM EACH DAY. EACH BALLON WAS FILLED TO A VOLUME OF 2500 IN^3

A) WICH FUNCTION REPRESENTS THE VALUME EACH DAY AS GEOMETRIC SEQUENCE:

an= 2500(1/5)^n-1 , an=2500(4/5)^n-1 , an=2500(1/5)^n, an=2500(4/5)^n

b) HOW MUCH HELIUM WILL BE IN THE BALLON ON THE 10 th DAY( ROUUND TO 3 DECIMAL INCHES CUBES)

Answer 1

If it loses 1/5 then 4/5 remain. Take it from there.