Why did general washington chose to cross the delaware under harsh conditions

General Washington chose to cross an ice-chocked Delaware River winter’s night because his purpose was to make a surprise attack on a Hessian garrison which consists of 1,400 soldiers located in and around Trenton, New Jersey. Washington had hoped that a fast victory in Trenton would boost morale in his army and encourage additional men to join Continentals rank in the coming new year.

most are appointed by the president and confirmed by a vote in the senate. however, appeals court judges appoint federal bankruptcy judges, and district judges appoint federal magistrate judges. the qualifications for these positions vary depending on the preferences of the person reviewing nominees.

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the perimeter of a triangle is 69 cm. side a is 5 cm shorter than side b. side c is twice as long as side a. find the length of each side. i need to know how to do it in 2 equations.  

equations:

a = b-5

c = 2a

a + b + c = 69