Sherri remembers seeing her brother punch in the number “9” as the first digit. Knowing one of the digits, what is the probability that Sherri will guess her brother’s code now?

Marcus and cody both leave the park at the same time, but in opposite directions. if cody travels 6 mph faster than marcus and after 4 hours they are 64 miles apart, how fast is each traveling? solve using rare times time = distance.