3 years ago

Please help , will give brainliest!

Mathematics

1 answer:

MissTica3 years ago

3 0

Answer:

2.3283064

Step-by-step explanation:

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Whats the sum of -7x*y + 4x^2 - 2 and 4x'y + 1 - 8x^y?

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Answer:

-7xy+4x^2-8 and y+1-8x^y

Step-by-step explanation:

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3 years ago

there are between 24 to 40 students in a class. the ratio of boys to girls is 4:7. how many students are in the class.

ZanzabumX [31]

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Step-by-step explanation:

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2 years ago

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Devon paid for 4 pounds of bananas with a $10 bill. He got back $4.00. What was the cost of 1 pound of bananas? $3.50 $24.00 $1.

Maksim231197 [3]

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Step-by-step explanation:

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3 years ago

The claim is that the proportion of adults who smoked a cigarette in the past week is less than 0.30, and the sample statistics

IrinaK [193]

Answer: 0.84

Step-by-step explanation:

let p be the population proportion of adults who smoked a cigarette in the past week.

As per given , we have

$H_a: p$

Sample size : n= 1491

The sample proportion of adults smoked a cigarette= $\hat{p}=\dfrac{x}{n}=\dfrac{462}{1491}=0.30985915493\approx0.31$

The test statistic for proportion is given by :-

$z=\dfrac{\hat{p}-p}{\sqrt{\dfrac{p(1-p)}{n}}}$

Substitute all the values , we get

$z=\dfrac{0.31-0.30}{\sqrt{\dfrac{0.30(1-0.30)}{1491}}}\\\\=\dfrac{0.01}{\sqrt{0.000141}}\\\\=\dfrac{0.01}{0.011874342087}=0.84261497731\approx0.84$

Hence, the value of the test statistic = 0.84

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3 years ago

Leticia charges $8 per hour to babysit. She babysat Friday night for 4 hours,

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Answer:

5 hours

Step-by-step explanation:

so you do 8 times 4

which gives you 32

72 - 32

40 divided by 8

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3 years ago