Why has our contemporary lifestyle, with many people spending hours sitting sedentary in front of televisions or computers, contributed to a significant rise in obesity? a. because low muscle tone promotes insulin insensitivity b. because blood glucose levels remain stagnant during inactivity c. because humans use energy very efficiently, and less activity causes us to use less energy d. because leptin is most effective when people are active?

The answer is C. Glucose, absorbed from food by our bodies, is saved as glycogen and fats when in excess and not being utilized. These reserves are stored to be used later during physical exercise. Living a sedentary lifestyle, therefore, causes the excessive accumulation of these storage reserves hence resulting in obesity.

9.9 years

a = p(1 + rt) . . account balance after time t at rate r starting with principal p

3000 = 2500(1 + 0.0202t) . . filling in the given numbers

1.2 = 1 + 0.0202t . . divide by 2500

0.2 = 0.0202t . . . subtract 1

0.2/0.0202 = t ≈ 9.901

it will take about 9.9 years for the account balance to reach $3000.

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