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3 years ago

42÷2x(11-8) answer please

Mathematics

2 answers:

MrRa [10]3 years ago

8 0

Answer:63x

Step-by-step explanation:

Divided and subtracted

Then calculated the product

Mandarinka [93]3 years ago

4 0

Answer:63

Step-by-step explanation:

42÷2×(11-8)

We are going to resolve the bracket part first ,because bracket comes first in BODMAS,in BODMAS B=bracket O=of D=division M=multiplication A=addition S=subtraction.

After resolving the bracket part we get 42÷2×3 also in BODMAS division comes first before multiplication,so we divide and get

21×3 finally 21×3=63

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Step-by-step explanation:

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2 years ago

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maria [59]

Answer:

Step-by-step explanation:

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2 years ago

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2 years ago

An engineer designed a valve that will regulate water pressure on an automobile engine. The engineer designed the valve such tha

BartSMP [9]

Answer:

The decision rule is

Reject the null hypothesis

Step-by-step explanation:

From the question we are told that

The population mean is $\mu = 5.6 \ pounds/inch^2$

The sample size is n = 160

The sample mean is $\= x = 5.7 \ pounds/ inch^2$

The variance is $\sigma ^2 = 0.25$

The level of significance is $\alpha = 0.01$

The null hypothesis is $H_o : \mu = 5.6$

The alternative hypothesis is $H_a : \mu > 5.6$

Generally the standard deviation is mathematically represented as

$\sigma = \sqrt{\sigma ^2 }$

=> $\sigma = \sqrt{0.25 }$

=> $\sigma = 0.5$

Generally the test statistics is mathematically represented as

$z = \frac{\= x - \mu }{ \frac{\sigma}{\sqrt{n} } }$

=> $z = \frac{5.7 - 5.6 }{ \frac{0.5 }{\sqrt{ 160 } } }$

=> $z = 2.53$

From the z table the area under the normal curve to the left corresponding to 2.53 is

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From the value obtained we see that the $p-value < \alpha$ hence

The decision rule is

Reject the null hypothesis

The conclusion is

There is sufficient evidence to conclude that the believe that the valve performs above the specifications is true

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3 years ago

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Rashid [163]

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3 years ago