Mark weighs 254 pounds and would like to lose weight. he starts a walking program that expends 1.2 kcal/pound/hour. if he walks 45 minutes a day for one week, how many calories will he burn in one week?

calories

Explanation:

Given

Weight of Mark pounds

Rate at which Mark burns calories kcal/pound/hour

Total time in one week in terms of hours minutes

minutes

Number of hours in minutes is equal to

hours

So, the total number of calories burned by Mark in one week

calories

stratosphere: as the altitude increases, the air temperature increases. the stratosphere has a layer of ozone, called the ozone layer. this layer absorbs most of the ultraviolet radiation from sunlight. this results in the stratosphere being warmer.

b is the correct answer