—>The area of a triangle whose vertices; A(1,-1, 2)m, B(2, 1, -1)m and C(3,-1,2)m
(1) 13m^2
(2) 8root13 m^2
(3) root13 m^2
(4) root26m^2

30 points - when can a theory be modified if a new type of technology allows for new observations that raise new questions? a. immediately, while the questions about the theory are being asked b. after new hypotheses related to the theory are tested in experiments c. only after the new observations disprove all parts of the theory d. while scientists begin to think about how the theory could improve

Glass has a hardness that is in the middle of the hardness scale. what is the hardness of glass?

What are some properties of transverse waves?