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Ainat [17]
3 years ago
15

Amy has 2 rows of 4 sports trophies on each of her 3 shelves. How many sports trophies does Amy have?

Mathematics
2 answers:
qaws [65]3 years ago
7 0
She has 24 trophies. 
Hope this helped!
kobusy [5.1K]3 years ago
5 0
Amy has 2 rows of 4 sports trophies each on 1 shelf.
To find out how many trophies are on each shelf, we have to multiply 2 * 4. When you do this, you get 8.

Thus, to find out how many trophies Amy has, we have to multiply the number of trophies on each shelf (8) by the number of shelves (3).

8 * 3 = 24

Therefore, Amy has 24 trophies.

Hope this helps! :)
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gizmo_the_mogwai [7]

Answer:

Yes it is constant.

Step-by-step explanation:

A constant rate means something "stays" the same.

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3 years ago
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Dmitriy789 [7]

Answer:

the 3rd One!

Step-by-step explanation:

8 0
3 years ago
A number is selected, at random, from the set {1,2,3,4,5,6,7,8}.
Olegator [25]

Applying the formula, you have:

A = the number is prime

B = the number is odd

I assume that with "random" you imply that all numbers can be chosen with the same probability. So, we have

P(A) = \dfrac{4}{8} = \dfrac{1}{2}

because 4 out of 8 numbers are prime: 2, 3, 5 and 7.

Similarly, we have

P(B) = \dfrac{4}{8} = \dfrac{1}{2}

because 4 out of 8 numbers are odd: 1, 3, 5 and 7.

Finally,

P(A \land B) = \dfrac{3}{8}

because 3 out of 8 numbers are prime and odd: 3, 5 and 7.

So, applying the formula, we have

P(\text{prime } | \text{ odd}) = \dfrac{P(\text{prime and odd})}{P(\text{odd})} = \dfrac{\frac{3}{8}}{\frac{1}{2}} = \dfrac{3}{8}\cdot 2 = \dfrac{3}{4}

Note:

I think that it is important to have a clear understanding of what's happening from a conceptual point of you: conditional probability simply changes the space you're working with: you are not asking "what is the probability that a random number, taken from 1 to 8, is prime?"

Rather, you are adding a bit of information, because you are asking "what is the probability that a random number, taken from 1 to 8, is prime, knowing that it's odd?"

So, we're not working anymore with the space {1,2,3,4,5,6,7,8}, but rather with {1,3,5,7} (we already know that our number is odd).

Out of these 4 odd numbers, 3 are primes. This is why the probability of picking a prime number among the odd numbers in {1,2,3,4,5,6,7,8} is 3/4: they are literally 3 out of 4.

5 0
3 years ago
The density of aluminum is 2.375 grams per cubic centimeter. Find the volume of a portion of a sheet of aluminum that has a mass
abruzzese [7]
This is the concept of density, volume and mass of different materials; To calculate for the volume of an aluminium material with density of 2.375 grams per cubic centimeter and a mass of 0.78 Kilogram we proceed as follows;

Density=mass/volume
making volume the subject we get;
volume=mass/density
thus;
mass=0.78 kg= 780 g
density=2.375 g/cm^3
Hence,
volume=780/2.375=328.421 cm^3
6 0
3 years ago
Read 2 more answers
You’re given 3 timings, all in the format of mm:ss (29:12 for example would mean 29 minutes and 12 seconds). They are labelled a
katrin2010 [14]
29 + 29 + 13 = 71
The range of possible times in seconds for x is 28:30 - 29:29. Similarly for y.
The range of possible times for z is 12:30 - 13:29
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To be recorded as 72 minutes the sum would be in the range 71:30 - 72:27 which is 58 seconds long
P(result recorded as 72 min) = 58/178

If you simply used the ranges [28.5, 29.5) [28.5, 29.5) and [12.5, 13.5)
then the sum would be in the range [69.5, 72.5)
and P(result recorded as 72 min) = 60 seconds / 180 seconds = 1/3

Using discrete times in seconds gives a slightly different answer but is also much harder to understand.
5 0
2 years ago
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