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True [87]
2 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]2 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]2 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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from the top of a tree the angle of depression of a rock on the ground is 49 degrees. If the tree is 18.5 m tall, how far is the
Rashid [163]

Answer:

Step-by-step explanation:

If you were to sit in the very top of said tree and look directly straight, your line of vision would be parallel to the ground. The angle of depression is in between your line of vision and the rock. When you look down at the rock, your line of vision to the rock is a transversal between the 2 parallel lines. With this being the case, the angle of depression is alternate interior with the angle made on the ground from the rock to the top of the tree. See the illustration I attached below.

We are looking for the distance on the ground between the tree and the rock, which we will call x. The side opposite the reference angle is the height of the tree and the side adjacent to the reference angle is x. Side opposite over side adjacent is the tangent ratio. Therefore,

tan(49)=\frac{18.5}{x} and

x=\frac{18.5}{tan(49)} and on your calculator in degree mode, you will find that

x = 16.08 m

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4 0
3 years ago
Simplify |−3 − 8|<br> A. –11<br><br> B. –5<br><br> C. 5<br><br> D. 11
bazaltina [42]

Answer:

<h3>It's answer is D. 11 </h3>

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| -3-8 |

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3 years ago
Write an expression to show the sum of fourteen and triple eight.
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<span>14x8³

have a good day!! :)
hope this helps!!! :D
plz give brainliest!! XD</span>
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Is this ordered pair a solution to the inequality?
VLD [36.1K]
2.2(5) - 4.33(1) >0
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B)Yes
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Step-by-step explanation:

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