The endpoints of a line segment are at the coordinates (3, -4, 6) and (5, 7, -2). What is the midpoint of the segment?
A. (4, 1.5, 2)
B. (7, 18, -10)
C. (1, -15, 14)
D. (1.5, -2, 3)
My answer: C
What is the distance between (5, -6, 4) and (4, -4, -2)? Round your answer to the nearest tenth of a unit.
A. 41
B. 5.9
C. 6.3
D. 6.4
My answer: B
What is the equation of the plane that contains the triangle shown in the diagram?
A. 2x + 3y + z = 6
B. 2x + 3y + 6z = 12
C. 3x + 2y + 6z = 0
D. 6x + 2y + 3z = 18
My answer: A
In the rectangular prism side IJ is parallel to side GF. The measure of angle EAJ is 50 degrees. What is the measure of the dihedral angle that is formed between plane ADIJ and plane ABCD?
A. 90 degrees
B. 180 degrees
C. 40 degrees
D. 50 degrees
My answer: B
Are these correct? If not, please show all work and DO NOT PUT LINKS IN YOUR ANSWER!