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Ratling [72]
3 years ago
9

A group of n friends go to the gym together, and while they are playing basketball, they leave their bags against the nearby wal

l. an evildoer comes, takes the student id cards from the bags, randomly rearranges them, and places them back in the bags, one id card per bag. (a) what is the probability that no one receives his or her own id card back? hint: use the inclusion-exclusion principle. (b) what is the limit of this proability as n â â? hint: e x = â â k=0 x k k! .
Mathematics
1 answer:
Viktor [21]3 years ago
5 0

Answer:

bro just ask around lol or go find the person problem solved

Step-by-step explanation:

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Last year, Liz gave 90 piano performances. This year, she gave 126 piano performances. What is the percent of increase in the an
Rashid [163]

Answer:

40%

Step by step explanation is given above

6 0
3 years ago
Heather has divided ​$5400 between two​ investments, one paying 8​%, the other paying 5​%. if the return on her investment is ​$
Phantasy [73]

Answer:

$2500 at 8%.

$2900 st 5%.

Step-by-step explanation:

Let x be the amount invested at rate of 8% and y be the amount invested at the rate of 5%.

We have been given that Heather has divided ​$5400 between two​ investments. We can represent this information as:

x+y=5400...(1)

The return on her investment is ​$345.  

Earnings from the investment at 8% will be 8% of x.

Earnings from the investment at 5% will be 5% of y.

(\frac{8}{100})x+(\frac{5}{100})y=345...(2)

0.08x+0.05y=345...(2)

We will use substitution method to solve our system of equations. From equation (1) we will get,

x=5400-y

Substituting this value in equation (2) we will get,

0.08(5400-y)+0.05y=345

432-0.08y+0.05y=345

-0.08y+0.05y=345-432

-0.03y=-87

\frac{-0.03y}{-0.03}=\frac{-87}{-0.03}

y=2900  

Therefore, Heather has invested an amount of $2900 at 5%.

Let us substitute y=2900 in equation (1) to solve for x.

x+2900=5400

x+2900-2900=5400-2900

x=2500

Therefore, Heather has invested an amount of $2500 at 8%.

6 0
3 years ago
En el colegio se realizó una campaña para medir el grado de obesidad de la población estudiantil. En la escuela hay 1 430 alumno
Lemur [1.5K]

Answer:

1144 o 286

Step-by-step explanation:

Si pregunta por la cantidad de personas que se pesaron, la respuesta es (8/10) * (1430) = 8 * 143 = 1144.

Si desea saber cuántas personas no se pesaron, la respuesta es 1430* (2/10) = 286

7 0
3 years ago
Press "F" to pay respects
astra-53 [7]

Answer:

big f f f f f f f f f f f big fffff

6 0
3 years ago
Read 2 more answers
What’s the inequality of x-3>8
sergiy2304 [10]

Answer:

x>11

Step-by-step explanation:

To simplify this inequality, we add 3 from both sides to get x-3+3>8+3. Since -3+3 cancels out to 0, we are left with x>8+3. 8+3=11 so x>11.

Hope this helps! If you need further explanation let me know :)

3 0
2 years ago
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