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stich3 [128]
4 years ago
13

If s = the number of students in a PE class, which algebraic expression represents the phrase below? the number of students in e

ach of 4 equal groups
A. s/4
B. s + 4
C. 4s
D. s – 4
Mathematics
2 answers:
stiv31 [10]4 years ago
4 0

pretty sure its A. s/4

EXPLANATION: s is the total amount of students and you have to divide s by 4 to split it into four equal groups

Hope this helps : )

Please rate and thank : )

Svetllana [295]4 years ago
3 0

Answer:

Step-by-step explanation:

alright, lets get started.

The total number of students are s.

We need to part these students in 4 equal groups, so we will divide total number of students with 4.

So, the number of students in each group : \frac{s}{4}

So, the answer is \frac{s}{4}     :     answer

Hope it will help :)

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A certain brand of refrigerator has a useful life that is normally distributed with mean 10 years and standard deviation 3 years
juin [17]

Answer: 0.55567

Step-by-step explanation:

Given : A certain brand of refrigerator has a useful life that is normally distributed with mean 10 years and standard deviation 3 years. The useful lives of these refrigerators are independent.

i.e.

\mu=10\text{ years}\\\sigma=3\text{ years}

Let X_1 and X_2 are two randomly selected refrigerator's life whose sum will exceed third selected refrigerator X_3 .

So that, X =X_1+X_2-1.9\times X_3

Mean =E(X_1)+E(X_2)-E(X_3)=10+10-1.9\times10 =1

Standard deviation =\sqrt{(Var(X_1)+Var(X_1)+Var(X_1))}

=\sqrt{(3^2+3^2+(1.9\times3)^2)}

=7.1056315694

Z-score : z=\dfrac{X-E[x]}{\sqrt{Var[x]}}=\dfrac{0-1}{7.0156315694}\approx-0.14

Now , The  probability that the total useful life of two(i..e n=2) randomly selected refrigerators will exceed 1.9 times the useful life of a third randomly selected refrigerator would be :-

P(Z>-0.14)=P(Z

Hence, the required probability is 0.55567.

3 0
3 years ago
A traffic helicopter descends to hover 477 meters above the ground. Let h be the original height of the helicopter. What is a su
prisoha [69]

The subtraction equation that represents the problem is ( h-477)metres

<h3>Subtraction problem</h3>

Given the following information

  • The original height of the helicopter = h meters

If the traffic helicopter descends to hover 477 meters above the ground, then the original height of the helicopter will be:

Original height = h - 477 (Since it is descending)

Hence the subtraction equation that represents the problem is ( h-477) meters

Learn more on subtraction problem here brainly.com/question/220101

6 0
3 years ago
HELP PLEASE How many times can 7 go into 332? Or tell me how you got the answer to 7 divided by 332. Show me how you did it step
Murrr4er [49]
7 times 48 is 336
7 times 47 is 329
332/7= 47.4
7/332=.021
8 0
3 years ago
Read 2 more answers
How many solutions does the system have?<br><br> y= -5x - 1<br> y = -5.2 + 7
mote1985 [20]

Answer:  y= -5x - 1

y = -5.2 + 7

Step-by-step explanation: y= -5x - 1 has 3.    y = -5.2 + 7  has 1

4 0
3 years ago
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sergiy2304 [10]

Answer:

485

Step-by-step explanation:

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8 0
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