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SOVA2 [1]
3 years ago
10

News cameras take an overhead picture of a part of a crowd at an outdoor event. Journalists then count the number of people in t

he picture and use the sample to estimate the total number of people in the crowd. This process is an example of
Mathematics
2 answers:
natta225 [31]3 years ago
8 0

Answer:

D, cluster sampling

Step-by-step explanation:

aliina [53]3 years ago
4 0

Answer:

cluster system

Step-by-step explanation: For edgunity

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Make r the subject of the formula t=<img src="https://tex.z-dn.net/?f=%5Cfrac%7Br%7D%7Br-3%7D" id="TexFormula1" title="\frac{r}{
Gnoma [55]

Answer:

r=\frac{3t}{t-1}

Step-by-step explanation:

So we have the formula:

t=\frac{r}{r-3}

And we want to make r the subject of the formula.

So, first, let's multiply both sides by (r-3). The right will cancel. So:

t(r-3)=r

Distribute the t:

rt-3t=r

Subtract rt from both sides. The left cancels:

-3t=r-rt

Factor out an r from the right:

-3t=r(1-t)

Divide both sides by (1-t). The right cancels:

\frac{-3t}{1-t}=r

Simplify the negatives:

\frac{3t}{t-1}=r

Flip:

r=\frac{3t}{t-1}

And we're done!

3 0
3 years ago
The least common multiple of two numbers is 40. The difference of the two numbers is 2. What are the numbers?
Olin [163]
8 and 10 because 8 x 5 equals 40 and 10 x 4 equals 40. and 10 minus 8 is two
4 0
3 years ago
How do I solve this systems of three equations problem?
Serhud [2]

Answer:

You have to eliminate one of the variables when the equations are added.

A) x + 2y + z = 10

B) 2x -y +3z = -5

C) 2x -3y -5z = 27

We mulutiply A) by 2 then add it to B and C

A) 2x + 4y + 2z = 20 and the sum =

6x = 42  Luckily, the "y" and "z" variables cancel out and we find:

x = 7  

Then we use x =7 in calcucating equation A) and B)

A) 2y + z = 3

B) -y + 3z = -19

THEN solve for y and z by eliminating variables.


Step-by-step explanation:


3 0
3 years ago
Use the distributive property to remove the parentheses.<br> −9(w−3y+6)
Kay [80]
-9w + 27y - 54
If that's all you need - You're just multiplying 9 with each number in the parenthesis! I hope all is well, and you pass! Good luck, rockstar. (:
6 0
3 years ago
Rick bought some tetra fish and goldfish for his fish tank. He bought twice as many goldfish as he did tetras. Each goldfish cos
kolezko [41]

The system of equations that can be used to determine the number of tetra fish and goldfish purchased is:
x = 2 y. 2 x + 1.5 y = 20

<h3>What are the system of equations ?</h3>

In order to determine the required values, two linear equations would be formed from the question. The two equations would exhibit the relationship between the two types of fishes:

The first equation would show the ratio between the two types of fishes bought: 2y = x

Th second equation would show the total cost of the two type of fish:1.5y + 2x = 20

To learn more about simultaneous equations, please check: brainly.com/question/16763389

#SPJ1

6 0
2 years ago
Read 2 more answers
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