19. B.
20. J.
Hope this helps :P
Sorry but I’m not that good with math I’m just trying to get my own answers but I pray that you get someone smart to help you answer it
Hello Madoudou!
#1
So we have:
F which is the number of faces we are looking for
E which are the numbers of edges
and V the number of vertices
We can use the Euler's polyhedron formula. Which is:
V - E + F = 2
Remember we are solving for F. Thus,
F = E - V + 2
F = 9 - 6 + 2
F = 9 - 4
F = 5
The correct answer is option B
#2
It is almost the same problem. They just want us to find the vertices.
V = E - F + 2
V = 36 - 25 + 2
V = 36 - 23
V = 13
The correct answer is option C
#3
<span>The cross section formed by a plane that contains a vertical line of symmetry for a tetrahedron is a Triangle.
The correct answer is option A
#4
</span>
<span>The cross section formed by a plane that intersects three faces of a cube</span><span> is a Triangle.
The correct answer is option A
Let me know if you have any questions about the answers. As always, it is my pleasure to help students like you.
</span>
Answer:
-1/2
Step-by-step explanation:
Slope is defined as change in x/change in y.
The x changed by 1/8-(-1/4)=3/8 and the y changed by -4-(-1/4)=(-3/4).
Now, divide the 2 fractions:
(-3/4)/3/8 = -3/4*8/3 = -4/8 = -1/2
