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zysi [14]
3 years ago
9

54 books make up 25% of the books in the library. How many books are there in the library.

Mathematics
2 answers:
3241004551 [841]3 years ago
7 0

The answer to your question would be 216.

If 54 makes up 25 percent, then x makes up 100 percent. Using this phrase we can write a proportion or use equivalent fractions.

54/25= x/100


A whole is 100 percent and we know 25 percent. Then it is simple to go from 25 percent to 100 percent. Simply multiply 25 times 4 to get 100 percent. Since we multiplied the denominator by four, then we have to multiply the numerator (54) by 4. 54 times 4 is 216.


Scrat [10]3 years ago
4 0

25% is 1/4.

This means that 1/4 of the books in the library is 54, so just multiply 54 by 4, which gives you 100%, or all of the books. 54 times 4 is equal to 216, so there are 216 books in the library.

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I understand I need help on this.
Anvisha [2.4K]

Answer:

A.  168 units³

Step-by-step explanation:

volume = area of bas × height

volume = (6)(7)/2 × 8

volume = 168 units³

4 0
2 years ago
BRAINLIEST PLEASE HELP!!!!
taurus [48]

Answer:

A. 2x + (-x + 2) = -1

Step-by-step explanation:

Well if we use x + y = 2 as the substitute we need to solve for y.

x + y = 2

-x to both sides

<u>y = -x + 2</u>

Substitute

2x + (-x + 2) = -1

<em>Thus,</em>

<em>the answer is A. 2x + (-x + 2) = -1.</em>

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<em>Hope this helps :)</em>

5 0
3 years ago
Help me plz <br><br>76° A B D с What is the measure of ZC? (Hint: just give numerical answer... ​
butalik [34]

Answer:

∠ACB = 38°

Step-by-step explanation:

∠ACB is an inscribed angle while arcAB is its intercepted arc

An inscribed angle is equal to half the length of its intercepted arc

Hence, ∠ACB = 1/2 the measure of arc AB

arc AB = 76°

Hence ∠ACB = 1/2 of 76

76/2 = 38

Therefore ∠ACB = 38°

8 0
2 years ago
Evaluateing expressions 9x-c
lyudmila [28]

Answer:

9x−c

= 9x + − c

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Step-by-step explanation:

3 0
3 years ago
In a study of the impact of smoking on birth weight, researchers analyze birth weights (in grams) for babies born to 189 women w
kompoz [17]

Answer:

c. Smoking is associated with lower birth weights. When smokers are compared to nonsmokers, we are 95% confident that the mean weight of babies born to nonsmokers will be between 76.5 grams to 486.9 grams more than the mean birth weight of babies born to smokers.

Step-by-step explanation:

The difference in mean birth weights (nonsmokers minus smokers) is 281.7 grams with a margin of error of 205.2 grams with 95% confidence.

Then, we know that the 95% confidence interval is (76.5, 486.9)

LL=M-MOE=281.7-205.2=76.5\\\\UL=M-MOE=281.7+205.2=486.9

<em>a. We are 95% confident that smoking causes lower birth weights by an average of between 76.5 grams to 486.9 grams.</em>

False, it interprets the confidence interval as a probability for individual cases. The confidence interval is a range for the population mean.

<em>b. There is a 95% chance that if a woman smokes during pregnancy her baby will weigh between 76.5 grams to 486.9 grams less than if she did not smoke.</em>

False, it interprets the confidence interval as a probability for individual cases. The confidence interval is a range for the population mean.

<em>c. Smoking is associated with lower birth weights. When smokers are compared to nonsmokers, we are 95% confident that the mean weight of babies born to nonsmokers will be between 76.5 grams to 486.9 grams more than the mean birth weight of babies born to smokers.</em>

True.

<em>d. With such a large margin of error, this study does not suggest that there is a difference in mean birth weights when we compare smokers to nonsmokers.</em>

There is enough evidence, as the lower bound of the confidence is positive. This means that there is only a probability of 0.05/2=0.025 that the true mean weight difference is smaller than 76.5 grams.

6 0
3 years ago
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