Find the circumference when the diameter is 12.4cm

Which logarithmic equation is equivalent to the exponential equation below? e^a=55(you will receive 34 points)

He that is measured at 220° is a reflex angle. the opposite angle is obtuse. find the measure of obtuse .

Awater tank holds 18000 gallons. how long will it take for the water level to reach 6000 gallons if the water is used at anaverage rate of 450 gallons per day