By 3000 b. c.e., traders from visited the northern coasts of new guinea. some of them settled there, while others continued exploring and establishing communities in pacific archipelagos.
a. africa
b. europe
c. south america
d. southeast asia

The answer is D. Southeast Asia

The northern coasts of New Guinea is really rich in Gold and Silver, which attract a lot of international Traders.

by 3000 B.C.E the  a lot of Melanesians that located around south east asia decided to settled in that area 

The answer to this is D. Southeast Asia. By 3000 BCE, the traders - mostly Chinese and Arabic while some are from India - visited the northern coasts of New Guinea. Some historical accounts they did settle and others only visited. 

Avertical or horizontal line used in graphs is called a(n) equatorhope this

In a right-angled triangle: 1- the hypotenuse is the longest side2- we can apply pythagorean rule which states that: (hypotenuse)^2 = (side1)^2 + (side2)^2for the given triangle,longest side is 15 cm  side1 = 9 cmside2 is 12 cm  to check whether the triangle is right-angled or not,compare (15)^2 to the summation of (9)^2 and (12)^in other words, compare 225 to the summation of 81 and 144if they are both equal, then the triangle is right-angles, otherwise, it is not.you haven't provided the diagram showing her work, so i cannot tell the choice. however, apply my explanation to the question you have.