Rosa works due north of home. Her husband Juan works due east. They leave for work at the same time. By the time Rosa is 7 miles from home, the distance between them is one mile more than Juan's distance from home. How far from home is Juan? ...?

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T7akaiteNaikkier T7akaiteNaikkier

22-11-2016
Mathematics

contestada

Rosa works due north of home. Her husband Juan works due east. They leave for work at the same time. By the time Rosa is 7 miles from home, the distance between them is one mile more than Juan's distance from home. How far from home is Juan? ...?

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Аноним Аноним · Answer 1 · 2016-11-24T02:27:59+01:00

This is a right triangle problem. c^2 = a^2 + b^2
Let b = 7 mi (Rosa's distance from home)
Let a = the east leg (Juan's distance from home
(a+1) = c (hypotenuse, distance between them)

(a+1)^2 = a^2 + 7^2

FOIL (a+1)(a+1)
a^2 + 2a + 1 = a^2 + 49

Combine like terms
a^2 - a^2 + 2a = 49 - 1
2a = 48
a =

a = 24 mi, Juan's distance from home

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