You are required to take five courses, one each in humanities, sociology, science, math, and music. you have a choice of 3 humanities courses, 2 sociology courses, 3 science courses, 8 math courses, and 3 music courses. how many different sets of five courses are possible?

Consider the reaction 2x2y2+z2⇌2x2y2z which has a rate law of rate= k[x2y2][z2] select a possible mechanism for the reaction.

How do you solve this step by step?

Sound travels about 750 miles per hour. a) suppose it takes about 1.5 seconds to hear the echo. how far away is the canyon wall, in feet? for this i got 825 ft b) suppose you stand 1,925 feet from the canyon wall and sound the horn. how long will it take to hear the echo? (i'm stuck on this)