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3 years ago

What is the additive identity of a

Mathematics

1 answer:

Lady_Fox [76]3 years ago

6 0

Answer:

a+0 (or just 0)

Step-by-step explanation:

The additive identity is when you add any number by zero. This is because an additive identity is what number do you add to make the same number (since it's additive it is zero, if it were multiplicative, it'd be 1)

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An article claims that 12% of trees are infested by a bark beetle. A random sample of 1,000 trees were tested for traces of the

inna [77]

Answer: 0.6812

Step-by-step explanation:

Let p be the population proportion of trees are infested by a bark beetle.

As per given: p= 12%= 0.12

Sample size : n= 1000

Number of trees affected in sample = 1000

Sample proportion of trees are infested by a bark beetle. = $\hat{p}=\dfrac{127}{1000}=0.127$

Now, the z-test statistic : $z=\dfrac{\hat{p}-p}{\sqrt{\dfrac{p(1-p)}{n}}}$

So, $z=\dfrac{0.127-0.12}{\sqrt{\dfrac{0.12\times 0.88}{1000}}}$

$z=\dfrac{0.007}{\sqrt{\dfrac{0.1056}{1000}}}\\\\\\=\dfrac{0.007}{\sqrt{0.0001056}}\\\\\\=\dfrac{0.007}{0.010276}\approx0.6812$

Hence, the value of the z-test statistic = 0.6812 .

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3 years ago

Each row of the table represents a cone with a height of

kykrilka [37]

8171 9 inches and different radius

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3 years ago

What is the length of XPY in terms of pi?

Elis [28]

Circumference of a circle = 2πr

Circumference of the whole circle= 2π(30) = 60π

360 - 90 = 270

Length XPY = 270/360 x 60π = 45π

Answer: 45π m

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3 years ago

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The number of dogs at the animal shelter is 150 less than the number of

Hoochie [10]

Answer:

48, hope this helps!

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2 years ago

Please answer asap its due today

Thepotemich [5.8K]

Answer:

rdh

Step-by-step explanation:

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3 years ago