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3 years ago

Need help learning 3rd grade perimeters n areas

Mathematics

1 answer:

pentagon [3]3 years ago

7 0

Perimeter is all sides added up.

Area is sometimes length times width with four sided figures like a rectangle or a square and for like triangles it is base times height.

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Is 18/54 equivalent to 3/9?

viva [34]

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3 years ago

Help i did the first part and id.k the rest.....

34kurt

Answer:

w=6x+1.25

Step-by-step explanation:

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3 years ago

joan reads that the mass of an average elephants brain is 3 4/10 kilograms greater than an average mans brain how many kilograms

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Step-by-step explanation:

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3 years ago

the wheel of a unicycle has a radius of 14 inches. About how many rotations will it take for the unicyle to tavel 440 inches

sdas [7]

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3 years ago

uppose germination periods, in days, for grass seed are normally distributed and have a known population standard deviation of 2

natka813 [3]

Answer: 0.701

Step-by-step explanation:

Formula : $EBM =z_{\alpha/2}\dfrac{\sigma}{\sqrt{n}}$ , where $\alpha=$ significance level , $\sigma =$ Population standard deviation, n= sample size.

As per given, n= 22

$\sigma = 2$

Critical z- value for 90% confidence level : $z_{\alpha/2}=1.645$

Then,

$EBM =(1.645)\dfrac{2}{\sqrt{22}}\\\\=(1.645)\dfrac{2}{4.690416}\\\\\approx0.701$

Hence , error bound (EBM) of the confidence interval with a 90% confidence level= ± 0.701

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3 years ago