When Justin was born, he was 45.7 cm long. Now he is four times as tall.
1 a) How tall is he now?
b) How old do you think he might be? Explain

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.