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3 years ago

Perform the Indicated Operation. (-18)-(4)

Mathematics

2 answers:

Tems11 [23]3 years ago

7 0

-22 is your answer because all you have to do is take 4 away from -18 and you get -22

abruzzese [7]3 years ago

6 0

Answer:

-22

Step-by-step explanation:

(-18)-(4)

We apply the rule of sign when we add or subtract the numbers.

When the signs of two numbers are same then we add the numbers and put the same sign. When the signs of two numbers are not same then we subtract the numbers and put the sign of greatest number.

$(-18)-(4)$

negative and positive becomes negative

$-18-4$

The signs are same so we add the numbers and put the same sign.

$-22$

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Public opinion in the large city of Bedrock is that 60 percent of the residents are in favor of increasing taxes to fund alterna

uysha [10]

Answer: 0.8461

Step-by-step explanation:

Let p be the proportion of residents are against the increase of taxes to fund alternatives to drug addiction treatment.

As per given , we have p=0.40

A random sample is taken with size : n= 400

Expecting sample proportion : $\hat{p}=\dfrac{150}{400}=0.375$

Now , the probability that more than 150 of the residents surveyed will be against increasing taxes if a random sample of 400 residents are surveyed will be :

$P(p>0.375)=P(\dfrac{\hat{p}-p}{\sqrt{\dfrac{p(1-p)}{n}}}>\dfrac{0.375-0.40}{\sqrt{\dfrac{0.40(0.60)}{400}}})$

$=P(z>\dfrac{0.375-0.40}{\sqrt{\dfrac{0.40(0.60)}{400}}})\ \ [\because\ z=\dfrac{\hat{p}-p}{\sqrt{\dfrac{p(1-p)}{n}}}]$

$=P(z>-1.02)=P(z-z)=P(Z$

$\approx0.8461$ [By z-table]

Hence, the approximate probability that more than 150 of the residents surveyed will be against increasing taxes if a random sample of 400 residents are surveyed is 0.8461 .

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3 years ago

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igor_vitrenko [27]

Answer:

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Step-by-step explanation:

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3 years ago

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konstantin123 [22]

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Step-by-step explanation:

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kobusy [5.1K]

Answer:

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Step-by-step explanation:

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2 years ago