HELP PLEASE, ASAP!! Evaluate the following when a = 3, b = 1/4 , and c = 5

b^-1/ ca^-1 - ac^-1

Please please help this will mean a lot to me if someone can answer this :(

The four students in the table below each recorded the time and distance traveled while exercising. exercising distance (miles) time (minutes) gia 2 30 harris 5 50 ian 3 40 jackson 4 80 which list ranks the students from fastest walker to slowest walker? jackson, gia, ian, harris harris, jackson, ian, gia harris, ian, gia, jackson jackson, harris, ian, gia