1) What is the role of public authority in society? Is it to demand obedience from citizens? Is it to protect?

This is a religion question

How many zeros does the function f(x)=4x3-x2+1 have

Find the area of the regular hexagon if a side is 20 cm.

Awater holding tank measures 105 m long, 50 m wide, and 8 m deep. traces of mercury have been found in the tank, with a concen- tration of 60 mg/l. what is the total mass of mercury in the tank? answer in units of kg.