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stiv31 [10]
3 years ago
6

A convex polyhedron has faces that consist of 30 squares, 20 triangles, and 12 pentagons. The polyhedron has 120 edges. How many

vertices does it have?
Euler’s formula: V + F = E + 2

a:60
b:92
c:122
d:180
THE ANSWER IS A:60 ON EDGE 2021
Mathematics
2 answers:
VLD [36.1K]3 years ago
5 0
D)))))) which is 180
True [87]3 years ago
3 0

Answer:

THE ANSWER IS D 180

Step-by-step explanation:

THE PERSON WHO MADE THIS QUESTION IS WRONG, PLS TRUST

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1: y=8, (-2,8)

2: y=6, (-1,6)

3: y=0, (2,0)

Step-by-step explanation:

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Answer:

Part A:

4 + x = y

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x = 8/3\ quarts\ of\ 100\%\ solution

y = 20/3\ quarts\ of\ 70\%\ solution

Part B:

x + y = 10

2x + 3y = 23

x = 7 and y = 3

Step-by-step explanation:

Part A:

The inicial concentration of the lemonade is 50%, and the volume is 4 quarts, and we will add x quarts of a lemonade with a concentration of 100%, so the total volume will be y, and the concentration will be 0.7, so we have that:

4 + x = y

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Using the value of y from the first equation in the second one, we have:

2 + x = 0.7*(4 + x)

2 + x = 2.8 + 0.7x

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x = 8/3\ quarts

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Part B:

If he shoots a total of ten targets, we can write the equation:

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Each stationary target is 2 points, and each moving target is 3 points, so if the total points is 23, we have:

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