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GrogVix [38]
3 years ago
8

A bag contains 5 yellow marbles and 10 blue marbles. If a representative sample contains 2 yellow ​marbles, then how many blue m

arbles would you expect it to​ contain? Explain. Because the ratio of yellow marbles to blue marbles is blank in the​ population, the expected number of blue marbles is blank times the number of yellow marbles in the representative sample. There should be blank blue marbles.
Mathematics
2 answers:
Komok [63]3 years ago
5 0

Answer:

4

Step-by-step explanation:

Dmitry [639]3 years ago
4 0

Answer:

There will be 4 blue marbles

Step-by-step explanation:

Yellow to blue marbles is in a ratio of:

5:10

the representative sample is:

2:x

simplee cross multiplication can be aplied

5x = 2*10

5x = 20

divide both sides by 5

x = 4

there should be four blue marbles

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A number is totally even if all its digits are even. For instance, the numbers 2022 is totally even. How many four-digit totally
dem82 [27]

Answer:

The units digit of our number should be and can be any of 0, 2, 4, 6  (four opportunities).

The tens  digit of our number should be and can be any of 0, 2, 4, 6  (four opportunities).

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The thousands digit of our number should be and can be any of 2, 4, 6  (three opportunities).

So, there are 4*4*5*3 = 16*15 = 240  such 4-digits totally even numbers, satisfying the condition.     ANSWER

Step-by-step explanation:

3 0
2 years ago
A student charges twenty dollars per hour to type college papers. The student's average typing speed is fifty words per minute.
coldgirl [10]

Answer:

The student should charge $210 for typing the paper ⇒ answer C

Step-by-step explanation:

* Lets explain how to solve the problem

- The rate of the student's typing is 50 words per minute

- The students charges twenty dollars per hour to type the college

 papers

- There is a paper contains 31,500 words

- We want to now how much the student should charge for it

* At first lets find his rate per hour

∵ 1 hour = 60 minutes

∴ 1 minute = 1/60 hours

∵ His rate = 50 words / 1 minute

- Lets change the minute to hour

∴ His rate = 50/(1 × 1/60) = 3000 words per hour

* Lets find the time he needs to finish the paper

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∵ Time = The number of words ÷ his rate of typing

∵ his rate is 3000 words per hour

∴ Time = 31,500 ÷ 3000 = 10.5 hours

∴ He needs 10.5 hours to finish the paper

∵ He charges $20 per hour

∵ The time to finish the paper is 10.5 hours

∵ The price of typing the paper = the charge per hour × number

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∴ The price of typing the paper = 20 × 10.5 = 210

∴ The student should charge $210 for typing the paper

7 0
3 years ago
Read 2 more answers
ASAP! GIVING BRAINLIEST! Please read the question THEN answer CORRECTLY! NO guessing. I say no guessing because people usually g
solmaris [256]

Answer:

A. p(x) = 19x - 15

Step-by-step explanation:

<u>→Set it up, like so:</u>

<u />(25x)-(6x+15)

25x - 6x-15

<u>→Add like terms (25x and -6x):</u>

<u />19x - 15

6 0
3 years ago
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