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marusya05 [52]
3 years ago
5

Three times a first number decreased by a second number

Mathematics
1 answer:
ki77a [65]3 years ago
3 0

Answer:

The two numbers are 3 and 5

Step-by-step explanation:

3X-Y=12\\X + 4Y=17\\

Multiply top equation by 4 to cancel out the Ys

12X - 4Y = 48\\X + 4Y = 17\\\\13X = 65\\X = 5\\

Since X =5, we can plug it into either of the top two equations to find out the value of Y

3(5) - Y = 12\\15 - Y = 12\\Y = 3

To double check

3(5) - 3 \\15 - 3\\12\\\\5 + 4(3) \\5 + 12\\17

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Please answer number 3
Elan Coil [88]

Answer:

1250

Step-by-step explanation:

?/5000 = 25/100 5,000x25= 125,000 divided by 100= 1250.00= 1250

8 0
3 years ago
There is a bag filled with 3 blue and 4 red marbles.
tresset_1 [31]

Using the hypergeometric distribution, it is found that there is a 0.4286 = 42.86% probability of getting 2 of the same colour.

The marbles are chosen without replacement, hence the <em>hypergeometric </em>distribution is used to solve this question.

<h3>What is the hypergeometric distribution formula?</h3>

The formula is:

P(X = x) = h(x,N,n,k) = \frac{C_{k,x}C_{N-k,n-x}}{C_{N,n}}

C_{n,x} = \frac{n!}{x!(n-x)!}

The parameters are:

  • x is the number of successes.
  • N is the size of the population.
  • n is the size of the sample.
  • k is the total number of desired outcomes.

In this problem:

  • There is a total of 3 + 4 = 7 marbles, hence N = 7.
  • Of those, 3 are blue, hence k = 3.
  • 2 marbles will be taken, hence n = 2.

The probability of getting 2 of the same colour is the sum of P(X = 0), which is both red, with P(X = 2), which is both blue, then:

P(X = x) = h(x,N,n,k) = \frac{C_{k,x}C_{N-k,n-x}}{C_{N,n}}

P(X = 0) = h(0,7,2,3) = \frac{C_{3,0}C_{4,2}}{C_{7,2}} = 0.2857

P(X = 2) = h(2,7,2,3) = \frac{C_{3,2}C_{4,0}}{C_{7,2}} = 0.1429

Hence:

p = P(X = 0) + P(X = 2) = 0.2857 + 0.1429 = 0.4286

0.4286 = 42.86% probability of getting 2 of the same colour.

You can learn more about the hypergeometric distribution at brainly.com/question/4818951

3 0
2 years ago
Ok so I need help on this ,asap plz :)
soldier1979 [14.2K]
Okay so to do the sqrt(75) you see if there are hidden squares. Split it to be the sqrt(25) and sqrt(3) then simplify. In the end, you get 5sqrt(3). Hope this helps!
4 0
3 years ago
3x41 using standard algorithm
MA_775_DIABLO [31]
41
X 4
=
164 that the answer using standard Algorithm
7 0
3 years ago
What is the value of x in the equation<br> 7/8x+3/4=-6?
dedylja [7]

Answer:

x = -54/7

Step-by-step explanation:

7 0
3 years ago
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