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snow_lady [41]
4 years ago
12

A polyhedron has 7 faces and 10 vertices. How many edges does it have

Mathematics
1 answer:
Serjik [45]4 years ago
5 0
EULER'S \: \: \: FORMULA \: - \\ \\ \\ For \: any \: convex \: polyhedron \: , \: the \: \\ number \: of \: vertices \: and \: faces \: \\ together \: is \: exactly \: two \: more \: than \\ \: the \: number \: of \: edges. \: \\ \\ Symbolically \: , \\ V-E+F=2 \\ \\ Here \: , \: F=7 \: \: and \: \: V=10 \\ \\ We've \: \: to \: \: find \: \: E \\  Using \: \: Euler's \: \: Formula \: \: , \\ \\ 10 - E + 7 = 2 \\ \\ \\ E \: = \: 15 \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: Ans.
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LOOK AT THE PICTURE <br><br> Please help I’m on a test will mark brainliest!
algol13

Answer:

2/7

Step-by-step explanation:

You have to flip the fraction to check, you see what times 3 gets you six... 2!

then what times one gets you 7.. 7! and that how you get 3/7

5 0
4 years ago
Write an equivalent expression. ​(x+5​)+4
Temka [501]

Answer:

x+9

Step-by-step explanation:

if you expand...you could get x+9, which is the same as the given expression

8 0
3 years ago
The number of games in the first round of a chess tournament is equal to 2×2×2×2×2×2. Write the number of games using an exponen
Naily [24]

Answer:

2^6

Step-by-step explanation:

2 is being multiplied 6 times meaning it would be 2 to the 6th power.

8 0
3 years ago
Please help asap 20 points plus brainlest<br><br> 5\6 of a pound + 3\4 of a pound = ??
HACTEHA [7]

Answer: 19/12 pounds or 1.583 pounds

Step-by-step explanation:

Let a pound be represented by x. So x = 1 pound.

5/6 of a pound is the same as multiplying 5/6 × x. It becomes 5/6 × x = 5x/6

3/4 of a pound is the same as multiplying 3/4 × x. It becomes 3/4 × x = 3x/4

We want to look for 5/6 of a pound + 3/4 of a pound.

It becomes

5x/6 + 3x/4

Taking lowest common multiple(LCM) of 12, it becomes

= (2×5x + 3×3x) / 12

= (10x +9x)/12

= 19x /12

Substituting x = 1 pound,

It becomes 19/12 pounds

Expressing in decimal, 19/12 = 15.83

We can also solve from the beginning in terms of decimals

5/6 pounds = 0.833 pounds

3/4pounds = 0.75 pounds

5/6 pounds + 3/4 pounds = 0.833 + 0.75 = 1.583 pounds

8 0
3 years ago
An article reports "attendance dropped 7% this year, to 6854." What was the attendance before the drop? (Round your answer to th
Masja [62]

Answer:

7370

Step-by-step explanation:

Let x represent attendance before drop.

We have been given that an article reports attendance dropped 7% this year, to 6854. We are asked to find the attendance before the drop.

Since attendance dropped by 7%, this means that attendance after drop was 93% of x.

We can represent this information in an equation as:

x-\frac{7}{100}x=6854

x-0.07x=6854

0.93x=6854

\frac{0.93x}{0.93}=\frac{6854}{0.93}

x=7369.89247

x\approx 7370

Therefore, the attendance before drop was 7370.

4 0
4 years ago
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