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kkurt [141]
3 years ago
7

PLEASE HELP ILL CHOOSE BRAINLIEST!!!!

Mathematics
2 answers:
Komok [63]3 years ago
7 0
4 gallons of water=30 plants

x gallons of water ?=45 plants 

to get the answer you have to follow these steps

4*45=x*30

180=30*x /30

x=180/30

x=6 gallons of water
MAXImum [283]3 years ago
4 0
30÷4=7.5
45÷7.5=6
you will need about 6 gallons of water to fill it.
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PLZ HELP I DONT KNOW IT!!:(Polly uses a probability simulator to pull colored ribbons from a bag 60 times and to flip a coin 60
Vanyuwa [196]

the answer is i belive 462/3600 because the total amount of times a ribbon has been pulled is 60 and the total amount of times a coin was flipped was 60 times as well so you would do 21/60 times 22/60 which 462/3600Step-by-step explanation:

4 0
3 years ago
A test consists of 100 multiple choice questions, each with five possible answers, only one of which is correct. Find the mean a
TEA [102]

Answer:  Mean = 20 and standard deviation = 4

Step-by-step explanation:

Let x represents the success of getting the correct answer.

Here, the total number of trials(n) = 100

The probability of getting the correct answer, p = 1/5

Thus, the mean of the number of correct answer,

\mu_x= np

\mu_x= 100\times 1/5

\mu_x= 20

Now, the standard deviation, \sigma_x= \sqrt{n\times p\times (1-p)}

\sigma_x= \sqrt{100\times 1/5\times 4/5}

\sigma_x= \sqrt{16}

\sigma_x= 4

Thus, First option is correct.



6 0
3 years ago
can anyone help me with this ??
Mars2501 [29]

Answer:

A. 336

B. Arranging 3 people in 8 chairs.

C. 42

B. Arranging 2 people in 7 chairs.

Step-by-step explanation:

A.

P(n, r) = P(8, 3)

Formula for Permutation is given as:

P(n, r) = \dfrac{n!}{(n-r)!}

Putting the value of n = 8 and r =3 , we get:

P(8, 3) = \dfrac{8!}{(8-3)!} \\\Rightarrow \dfrac{8\times 7 \times 6 \times 5\times 4 \times 3 \times 2\times 1}{5\times 4 \times 3\times 2\times 1}\\\Rightarrow 8\times 7 \times 6 \\\Rightarrow 336

B. Real world situation for part A:

Arranging 3 people on 8 chairs.

First person has 8 options.

Second person has 7 options.

Third person has 6 options.

C.

P(n, r) = P(7, 2)

Formula for Permutation is given as:

P(n, r) = \dfrac{n!}{(n-r)!}

Putting the value of n = 7 and r = 2 , we get:

P(7, 2) = \dfrac{7!}{(7-2)!} \\\Rightarrow \dfrac{7 \times 6 \times 5\times 4 \times 3 \times 2\times 1}{5\times 4 \times 3\times 2\times 1}\\\Rightarrow 7 \times 6 \\\Rightarrow 42

D.  Real world situation for part AC:

Arranging 2 people on 7 chairs.

First person has 7 options.

Second person has 6 options.

4 0
3 years ago
Ariana wants to make $207 she makes $10 a week how many weeks and months does she need to work to make $207
NISA [10]

It takes 5 months and 1 week (21 weeks)


6 0
3 years ago
Read 2 more answers
Andrew makes $10 per hour babysitting and $8 per hour working at the grocery store. He will need to make atleast $650 to buy a n
Ivahew [28]

Answer:

True

Step-by-step explanation:

Since babysitting and working at the grocery store are two different things, you would need two different variables.

So x and y would be the correct representation.

Hope this helps ya!!

3 0
2 years ago
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