Menes, the king of Upper Egypt, united the two regions of Upper Egypt and Lower Egypt. What feature served as a highway linking the two regions?

the decreasing neutrality of the u. s. in world war i

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answer; ///(1) blank; henry clay; (2) blank; secretary of state; (c)is your answer; ///good luck

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