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Anika [276]
3 years ago
13

Kim's age is twice that of her sister. When you add Kim's age to her sister's age, you get 60. How old is each sister? (a) Write

an equation that represents the situation. Explain any variable used. (b) Solve the equation from Part (a). Show your work. State your solution as a complete sentence.
Mathematics
2 answers:
Leni [432]3 years ago
6 0

Let Kim = k, and her sister = s

k = 2s

k + s = 60

First, plug in 2s for k in the equation "k + s = 60"

2s + s = 60

Simplify

(2s + s) = 60

3s = 60

Isolate the s. Note the equal sign. What you do to one side, you do to the other. Divide 3 from both sides

3s/3 = 60/3

s = 60/3

s = 20

Her sister is 20 years of age.

hope this helps

Lana71 [14]3 years ago
5 0
Her sister is 20 years old
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The base of a prism has n sides. Find the numbers of faces, edges, and
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Answers:

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===========================================================

Explanation:

Think of a hexagonal room with n = 6 walls, i.e. the floor is a hexagon with n = 6 sides. The floor and ceiling are parallel to each other, and congruent hexagons. That's 2 faces so far. Then we have another 6 faces to account for the walls. This gives 2+6 = 8 faces of a hexagonal prism.

In more general terms, a prism with a base of n sides will have 2 parallel and congruent base faces, and n walls or lateral faces. This gives n+2 total faces.

------------------------

Let's go back to the hexagonal prism. The floor has 6 sides to it, and so does the ceiling. We have 6+6 = 12 edges so far. Then we have another 6 edges where each of the rectangular walls meet up. That gives 12+6 = 18 edges total of this hexagonal prism room.

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--------------------------

Once again lets revisit the room with the hexagonal floor and ceiling. The floor has 6 vertices and the ceiling has the same vertex count. Therefore, this prism has 6+6 = 12 vertices.

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One way to check the answer:

We could use Euler's Polyhedron Formula which is

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Then notice how

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This confirms the formula works for a hexagonal prism.

Now let's check it for the more general case

We found earlier that,

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So,

F+V-E = 2

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This helps confirm the answer for any prism with the base of n sides.

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