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Mekhanik [1.2K]
3 years ago
6

If you subtract 20 from twice a number the result is six what is the number

Mathematics
1 answer:
Sati [7]3 years ago
8 0
Let x be the number you want to know. Then
2x - 20 = 6
2x = 6 + 20
x =  \frac{6 + 20}{2}
x = 13
The number is 13
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For the polyhedron, use Euler's Formula to find the missing number.
disa [49]

If the number of the edges of the polyhedron is 14 and the vertices are 9. Then the number of the faces of the polyhedron is 7.

<h3>What is a polyhedron?</h3>

A polyhedron is a solid made composed of polygons in three dimensions. It has vertices, flat faces, and straight edges.

We know the Euler's formula

F + V - E = 2,

where, F = number of faces, V = number of vertices, and E = number of edges

Edges: 14

Vertices: 9

F + 9 - 14 = 2

            F = 14 + 2 - 9

            F = 16 - 9

            F = 7

Then the number of the faces of the polyhedron is 7.

More about the polyhedron link is given below.

brainly.com/question/2321456

#SPJ1

3 0
1 year ago
How would I find the difference of 7/8 - 1/3 ?
Lemur [1.5K]

Answer:

\frac{13}{24}

Step-by-step explanation:

We have two fractions and are being asked to subtract them.

7/8 and 1/3 don't have the same denominator, so to do as so, we need to find the LCM of both denominators, multiply them to that, and do the same for the numerators.

So what is the LCM (Least Common Multiple) of 8 and 3?

24.

Therefore :

\frac{7 * 3}{8 * 3} - \frac{1*8}{3*8}

\frac{21}{24} - \frac{8}{24}

\frac{13}{24}

5 0
3 years ago
Read 2 more answers
What is an equation of a line that passes through the point (-2 3) and is parallel to the line whose equation is y=3/2x-4?
AleksandrR [38]
Ssssjsjdjsjdndnjdjsjsjsjdjdjdjdjdjdkejenendkdjd

3 0
3 years ago
A Wheel has a radius of 15 cm. Approximately how how far does it travel in 4 revolutions
victus00 [196]

Answer:

Roughly 376.99 cm(If im doing this right.

Step-by-step explanation:

6 0
3 years ago
A manufactured lot of buggy whips has 20 items, of which 5 are defective. A random sample of 5 items is chosen to be inspected.
dimulka [17.4K]

Answer:

a. 39.55%

b. 44.02%

Step-by-step explanation:

We have the following data:

n = 5

x = 1

p = 5/20 = 0.25

to. If the sampling is done with replacement.

We apply the binomial distribution formula, which is as follows:

P = nCx * (p ^ x) * ((1-p) ^ (n-x))

Where nCx, is a combination, and is equal to:

nCx = n! / x! * (n-x)!

replacing we have:

5C1 = 5! / 1! * 4! = 5

replacing in the main formula:

P = 5 * (0.25 ^ 1) * ((1- 0.25) ^ (5-1))

P = 0.3955

that is, without replacing the probability is 39.55%

b. if the sampling is done without replacement.

Here it is a little different from the previous one, but what you should do is calculate three cases,

the first was the one at point a, when n = 5 and x = 1

5C1 = 5! / 1! * 4! = 5

the second is when n = 20 and x = 5, this is all possible scenarios.

20C5 = 20! / 5! * 15! = 15504

and the third is when n = 15 (20-5) and x = 4 (5-1), which corresponds to the cases when none were damaged

15C4 = 15! / 4! * 11! = 1365

In the end, it would be:

P = (5C1 * 15C4) / 20C5

Replacing:

P = 5 * 1365/15504

P = 0.4402

Which means that without replacing the probability is 44.02%

7 0
3 years ago
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