Quadrilateral A'B'C'D' is the image of quadrilateral ABC D under a rotation about the origin, (0,0).
y
7
6
B
C.
A
J
4
3
2-
11
D
1 2 3 4 5 6 7
-7-6-5-4-3-2
D'
-2-
-3-
-4-
A
C'
B-6-
-7
Determine the angle of rotation.

Solve the equation 3x2 + 19x + 9 = 0 to the nearest tenth.

Anyone know? is appreciated! will mark brainliest if correct!

He mass of a single atom of carbon can be found by dividing the atomic mass (12.01 g) by 6.022 x 10^23. which is the mass of a single carbon atom, correctly written in scientific notation with the correct number of significant figures?