What greek or persian achievement do you think has had the most influence on our lives today? why do you think this? need the answer ! in advance

The Greeks made important contributions to the sciences. Biology, Physics, Physiology, Zoology: all Greek names, because the Greeks were the first to systematically explore these areas. Thales, the first Greek philosopher, also is the father of physics, asking a fundamental question: what are all things made of? The Greeks explored the question, coming up with promising answers. Ultimately, Greeks like Aristotle believed that the world was made up of four fundamental elements. Other Greeks added the idea that these elements in their turn were made up of invisible, indivisable particles they called atoms. Now we have a lot more elements than the Greek four, and we believe the atom can be divided into evern more fundamental particles, but note that the Greeks are certainly on the right track.

formulating the initial idea for the policy

answer is c.

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