The price of a stock steadily decreased by a total of $123 over the past 14 months.

Answer this question only if you know the answer! 30 points and

Martha is training for a duathlon, which includes biking and running. she knows that yesterday she covered a total distance of over 55.5 miles in more than than 4.5 hours of training. martha runs at a speed of 6 mph and bikes at a rate of 15.5 mph.

Me because i don't understand how to do it.: )