Work out the new amount after a 15% decrease

A) 50ml
B) 44kg
C) $320
D) £210

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

Anyone know these questions? i need ,.

3.4a=57.8 what is the the value of a