Solve the Problem. -The Average Height of a Boy in the United States

question 43

Multiple Choice

Solve the problem.
-The average height of a boy in the United States, from birth through 60 months, can be modeled by y = 2.9x + 20.1 where y is the average height, in inches, of boys who are x months of age. What would be the expected difference in height between a child 25 months of age and a child 16 months of age?

• A) 43.1 in.
• B) 14.5 in.
• C) 4.9 in.
• D) 2.9 in.

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Definitions:

Circadian Rhythms

Natural, internal processes that regulate the sleep-wake cycle and repeat roughly every 24 hours.

Melatonin

A hormone produced by the pineal gland that regulates sleep-wake cycles.

Cortisol

A steroid hormone released by the adrenal glands in response to stress or low blood-glucose concentration; plays a significant role in the body's response to stress.

Erythropoietin

A hormone produced by the kidneys that stimulates the production of red blood cells in the bone marrow.