Compare the decline or fall of the ancient Greek empire to the Mongol Empire when it fell? Think of the similarities or differences between the two empires.

Please help me out, this is due tomorrow :,)

your answer would be (a)

there is no photo, therefore i can not answer your question.

worldwide, 780 million people do not have access to an improved water source. an estimated 2.5 billion people lack access to improved sanitation (more than 35% of the world's population)

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