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True [87]
3 years ago
12

Erica wants to know how many books on average are in school libraries in her county. She randomly calls 50 school libraries in h

er county and finds out how many books they have. She adds the number of books together and divides by 50. Her conclusion is there are an average of 18,000 books in a school library. Erica's conclusion is
Mathematics
2 answers:
Rus_ich [418]3 years ago
5 0
<span>valid. She used a representative sample
</span>because she correctly found the average and 18,000 is a reasonable number to get for a the problem
Svet_ta [14]3 years ago
5 0

Answer:

the answer is C. because Even though Erica only called 50 school libraries, this is a sufficient number. Erica’s conclusion is valid. She used a representative sample.

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2 years ago
What is the value of x if x over 5=3
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Answer:

x = 15

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The factorization below is missing two positive integers a and b. 6x^(3)+18x^(2)-240x=6x(x-a)(x+b) Factor the polynomial and the
Dvinal [7]

Answer:

a = 5

Step-by-step explanation:

Hello, please consider the following.

6x^3+18x^2-240x=6x(x^2+3x-40)\\\\\text{** The sum of the zeroes is -3=-8+5 and the product is -40=-8*5. **}\\\\\text{** So, we can factorise. **}\\\\6x^3+18x^2-240x=6x(x^2+3x-40)=6x(x^2+8x-5x-40)\\\\=6x(x(x+8)-5(x+8))\\\\\large \boxed{=6x(x+8)(x-5)}

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7 0
3 years ago
If the dimensions of the following cylinder are quadrupled, what will be the volume of the new similar cylinder?
Alik [6]

Answer:  First option is correct.

Explanation:

Since we have given that

Radius = 11 inches

Height = 14 inches

Now, according to question, we have mentioned that all the dimensions of the cylinder is to be quadrupled i.e. four times.

Then,

Radius is given by

4\times 11=44 inches

Height is given by

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As we know the formula for " Volume of cylinder ":

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Therefore, First option is correct.


6 0
3 years ago
Read 2 more answers
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