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Svetllana [295]
4 years ago
15

Two coins have a radii of 3 cm and 1 cm the smaller coin rolls along the circumference of the fixed larger coin until the smalle

r coin returns to its original position. How many revolutions has the small coin made?
Mathematics
1 answer:
dezoksy [38]4 years ago
6 0
I think you have to do 3cm/1cm

I think the small coin makes 3 revolution
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Elanso [62]

Answer:

The measure of angle BCD is 68.5\°

Step-by-step explanation:

step 1

Find the value of x

we know that

m -----> form a straight line

substitute the values

(3x+4)\°+(6x-8)\°+(7x-20)\°=180\°

(16x-24)\°=180\°

16x=180\°+24\°

16x=204\°

x=12.75\°

step 2

Find the measure of angle BCD

m

substitute the value of x

m

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3 years ago
The coordinates below represent a triangle that was dilated with a factor of 2/3
Ierofanga [76]

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(−2, 3)

Step-by-step explanation:

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4 years ago
Can somebody help me please?
Nina [5.8K]

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it's a that's the answer

7 0
2 years ago
Function or not a function
Shkiper50 [21]

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  • Not a function.

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<u>Functions have graphs or slopes.</u>

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7 0
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In order for a vaccine to be effective, it should reduce a person's chance of acquiring a disease. Consider a hypothetical vacci
Dmitrij [34]

Answer:

Step-by-step explanation:

Let assume that Suppose the chance of contracting malaria is 10% for those who are not vaccinated ;   (since the value) is not given.

Thus;

If the vaccine has no effect, risk of malaria for vaccine and no vaccine are equal to 0.1

Probability of not getting malaria if vaccinated or no vaccinated = 1 - 0.1 = 0.9

                          Malaria                No Malaria               Total

Vaccinated     100 * 0.1 = 10        100 * 0.9 = 90                         100

No Vaccine     200 * 0.1 = 20   200 * 0.9 = 180        300-100 = 200

Total                 20 + 10 = 30       90 + 180 = 270                       300

If the vaccine cuts the risk by half, risk of malaria for vaccinated are equal to 0.1/2 = 0.05

Probability of not getting malaria if vaccinated = 1 - 0.05 = 0.95

                          Malaria                No Malaria               Total

Vaccinated     100 * 0.05 = 5         100 * 0.95 = 95                 100

No Vaccine     200 * 0.1 = 20   200 * 0.9 = 180        300-100 = 200

Total                 20 + 5 = 25       90 + 180 = 275                         300

3 0
3 years ago
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