The midpoint of AB is M(-6,-4). If the coordinates of A are (-4, -3), what are the coordinates of B?

Geologists use  seismic waves to  locate an earthquake's epicenter.. 

Humans have survived and thrived in mexico city by using technology to create greater access to land. when the spanish conquered the aztec capital, tenochtitlan, in the 16th century, they built mexico city by draining the lakes and filling in the lake water to create more arable land for agriculture. this technique of land reclamation has continued to be fundamental to human civilization in mexico city. 

Exploration mission 2;

Is a glitch? jaja support qin fen on his debut with awaken f