Answer: b
Step-by-step explanation:
Tan80=5.67
2tan70+tan10=5.67
So tan80=2tan70+tan10

Hey there! Our goal here is to isolate the variable on one side of the equation.

Time from October 5 to January 16
T=26+30+31+16=103 days
I=1870*0.11*103/365=58.05