Which sioux leader stormed out of negotiations about fortifying the bozeman trail?

Chief Red Cloud was the Sioux leader who stormed out of negotiations about fortifying the Bozeman Trail. Chief Red Cloud stormed out of the conference vowing that he would make the Bozeman Trail run with blood. He demonstrated that Carrington was the "white eagle" that had come to build a road through the Sioux hunting grounds. The forts constructed by Carrington were soon under siege, and in the first few months, they were under attack where 154 whites were killed while 20 were wounded. Around 700 horses, cows, and mules were driven off during this period.

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

geography

this is because warmer climates often don't get people sick from the flu and regions where it was often colder more people received the flu. hope this if you need more reasoning i am here to