Part A
Choice 2- The difference between 2 and -1 is -3.
Part B
Martha's total score is -2
D is the answer. Substitute 1 for x and 0 for your.
Answer:
The area of the two-dimensional cross section is 
Step-by-step explanation:
we know that
The two-dimensional cross section that is parallel to face ABC is a triangle congruent with the triangle ABC
Therefore
Calculate the area of triangle ABC

we have that
Triangles ABC and DEF are congruent
so


substitute

Answer:
I just did it came up with answer but not one of them. This the right answer