Which transformation method played the greatest role in the industrial revolution that occurred in America in the first two decades after the civil war The answer is railroads​

1. they could both use a veto to cancel an action.

2. women couldn't vote in the roman republic but could in the united states

i think it was because of how protected egyptian civilization was was which allowed them to evolve without much outside influence.

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