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The boiling point of water at sea level is 212 degrees Fahrenheit ( ° F ) . For every 550 feet above sea level , the boiling point of water is lowered by about 1 ° F . Which of the following equations can be used to find the boiling point B of water in degrees Fahrenheit, feet above sea level ?

A. B = 212 - x / 550
B. B= 212 + x / 550
C. B = 550 + x / 212
D. B = 550 - x / 212

Respuesta :

Answer:

A. B = 212 - x / 550

Explanation:

boiling point, sea level:

∴ T = 212 °F ⇒ x = 0 ft

∴ x = 550 ft ⇒ T (↓) 1 °F

boiling point equation:

⇒ B(°F) = 212 - x(ft) / 550

checking:

if x = 0 ft:

⇒ B(°F) = 212 - 0 / 550 = 212 °F

if x = 550 ft

⇒ B(°F) = 212 - 550 / 550 = 212 - 1 = 211 °F; the boiling point is lowered by about 1 °F.