Why are eyewitness accounts important to historical research? O because human error can make historical research unreliable
because events are often the result of chance, oversight, or error
because researchers can reject other factors that affected history
because events are carefully planned and need careful observation

c) troops march forward in close formation against newer, more accurate weapons

your answer will most likely be a.

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