Need help for my midterms

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

Bruce is getting materials for a chemistry experiment his teacher gives him a container that has 0.25 liter of liquid in it.bruce need to use 0.4 of this liquid for the experiment. how much liquid will bruce use?

Name each raycalculation tip: in ray "ab", a is the endpoint of the ray.