The correct answer is the last choice. You use the quadratic formula
-b+-√(b^2-4ac)/2a
-3+-√(9-4*1*7)/2
-3+-√-19/2
=-3+-√19/2
Hope this helps!
Answer:
i can't even read what that is
Step-by-step explanation:
Answer:
- hexahedron: triangle or quadrilateral or pentagon
- icosahedron: quadrilateral or pentagon
Step-by-step explanation:
<u>Hexahedron</u>
A hexahedron has 6 faces. A <em>regular</em> hexahedron is a cube. 3 square faces meet at each vertex.
If the hexahedron is not regular, depending on how those faces are arranged, a slice near a vertex may intersect 3, 4, or 5 faces. The first attachment shows 3- and 4-edges meeting at a vertex. If those two vertices were merged, then there would be 5 edges meeting at the vertex of the resulting pentagonal pyramid.
A slice near a vertex may create a triangle, quadrilateral, or pentagon.
<u>Icosahedron</u>
An icosahedron has 20 faces. The faces of a <em>regular</em> icosahedron are all equilateral triangles. 5 triangles meet at each vertex.
If the icosahedron is not regular, depending on how the faces are arranged, a slice near the vertex may intersect from 3 to 19 faces.
A slice near a vertex may create a polygon of 3 to 19 sides..
Answer:
Option D.
Step-by-step explanation:
Recall that the wider the confidence interval, the greater the variability.
In other words, wider confidence interval will have bigger sample standard deviation.
For option A, the width is |48-42|=6
For option B, the width is |50-40|=10
For option C, the width is |55-35|=20
For option D, the width is |45.5-44.5|=1
Therefore the team in option D has the smallest sample standard deviation.
As for the confidence level, it is just telling us the extent to which we confidence that, the parameter is within the interval
Answer:
The answer is 47
Step-by-step explanation:
I'm pretty sure this is the answer :)
40 - 28 = 12
35 + 12 = 47
Proof: 35 - 28 = 7
47 - 40 = 7