What is the product of (2/5x-3/4y^2) and (2/5x+3/4y^2)?

15m is what percent of 60m; 3m; 30m; 1.5 km? the last one is km not m

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

Which expression is equivalent to -12(3x-3/4)