Answer:
t<0
Step-by-step explanation:
doesn't need step by step cuz t is less than 0
The formula of an arithmetic sequence is the following :

A geometric sequence is in the form:
5.21 + 0.6 - (0.27 / 3) I assume this is the right equation
5.21 + 0.6 = 5.81
0.27 / 3 = 0.09
5.81 - 0.09 = 5.72
BDA=30=>BAD=60
TanBAD = tan60 =BD/BA => BD=...
TanACB=tan60=AB/BC=BC=...
CD=BD-BC=...