Do you think there was a big change in the way people lived during the Neolithic period? For 50 points

The massive changes in the way people lived also changed the types of art they made. Neolithic sculpture became bigger, in part, because people didn't have to carry it around anymore; pottery became more widespread and was used to store food harvested from farms. ... This is another characteristic of the Neolithic era.

Yes, there was a big change,

first second and third

explanation:

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