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Ilia_Sergeevich [38]
4 years ago
5

One of the angles of a regular decagon is 144°. What is the sum of the measures of all the interior angles of this decagon?

Mathematics
2 answers:
dsp734 years ago
7 0
The answer would be c. 1440

Decagon has 10 sides. And one angle is 144. So you would multiply it by 10 and the sum of all the angles would be 1440.
alexdok [17]4 years ago
3 0

Answer: 1440

Step-by-step explanation:

Regular means all angles are equivalent. Since their are 10 sides in the decagon, the sum of the interior angles is 144 * 10.

Alternatively, the sum of the measures of the interior angles in the decagon, can also be found by  applying the formula (n-2) * 180, where n is the number of sides.

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A number is chosen at random from the first 100 positive integers. Find the probability that the number is not divisible by 10 o
KiRa [710]
So, possible numbers divisible by 10.
There are 10 of them in the first 100 positive integers.
10, 20, 30, 40, 50, 60, 70, 80, 90, and 100.
And then the ones divisible by 3. There are 33.
3, 6, 9, 12, 15, 18, 21.. you get my point.
However, three of those are shared, 30, 60, and 90. 
So basically add the two together and subtract three for the shared ones. 
10 + 33 - 3 = 40
So there are 40 possibilities, so there is a 4/10 chance that the number is divisible by 10 or 3, so a 6/10 chance that the number is not divisible.
Or 3/5.
7 0
3 years ago
during a test of a totalizing flow meter, the water depth rose 15 inches in a tank 18 inches in diameter. What was the total flo
sattari [20]

Answer:

The total flow in gallons is approximately 16.524 gallons

Step-by-step explanation:

The given diameter of the tank, D = 18 inches

The amount by which the water depth rose, Δh = 15 inches

The quantity being measured = The total flow = The change in volume of water in the tank

The change in the volume of the water in the tank, ΔV = (π × D²/4) × Δh

Substituting the known values, gives;

ΔV = (π × D²/4) × Δh = (π × (18 in.)²/4) × (15 in.) ≈ 3817.035 in.³

1 gallon = 231 in.³

ΔV ≈ 3817.035 in.³ = 3817.035 in.³ × 1 gallon/(231 in.³)  ≈ 16.524 gallons

The change in the volume of the water in the tank, ΔV in gallons = The total flow in gallons ≈ 16.524 gallons.

4 0
3 years ago
A pair of parallel lines is cut by a transversal, as shown below: A pair of parallel lines is cut by a transversal. The interior
STALIN [3.7K]
Alternate interior angles are congruent so x = y
4 0
3 years ago
Read 2 more answers
Mhanifa please help look at the picture attached
olga55 [171]

Answer:

  • B. (3, 2)

Step-by-step explanation:

<u>Given vertices of triangle:</u>

  • A(1, 2), B(3, 4), C(5, 0)

<u>The centroid is found as the average of x- and y- coordinates of three vertices:</u>

  • C = ((x₁ + x₂ + x₃)/3, (y₁ + y₂ + y₃)/3)

<u>Substitute the coordinates into formula:</u>

  • C = ((1 + 3 + 5)/3, (2 + 4 + 0)/3) = (3, 2)

Correct choice is B

3 0
3 years ago
Read 2 more answers
TRUE OR FALSE QUESTION
stira [4]

That's false.  p(x) can have any number of linear factors (one or more).

p(x) = x(x+1)(x+2)(x+3)

has p(-3)=0 and four linear factors.

7 0
4 years ago
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