Herbicide tolerant cops allow farmers to kill ___without killing the crops

V1t2 = v2t1 is an expression of who’s law

Mike and mitchell decide to have a foot race. they mark off a stretch of 100 yards, and recruit cindy to work the stopwatch. after running the race and looking at the results, cindy declared that mitchell was the fastest. so how did the boys times compare?

Which number should be placed before f2 on the reactants side equation to make equation balanced? xe + > xef4