Plz help! Due tonight! Describe why 1968 is a year that stands out in a decade full of chaos and explain what impact 68' had on the United States as a whole.

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

on my last question

it would be a. that is the only one i could think of

the viking voyages took place during the middle ages, which was about this time. 500 to 1350. the viking voyages took place during the middle ages, which was about this time.