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3 years ago

Which operation should you perform first in the expression 12 x 4^2

Mathematics

1 answer:

Degger [83]3 years ago

7 0

Answer:

4^2

Step-by-step explanation:

Order of operations:

Parentheses

Exponents

Multiplication

Division

Addition

Subtraction

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What is the standered form of the number shown in the calculator display? <br> 3.82e+7

ella [17]

the answer is 38200000

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3 years ago

If the measure of angle BDC=100°, measure of angle A = 50°, and measure of angle DBC= 30°. which statement is true?

expeople1 [14]

B. triangle ABC is isosceles. The angles add up 180 degrees.

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2 years ago

Consider the incomplete paragraph proof.

Leya [2.2K]

The hypotenuse is $c = a\sqrt{2}$ times the length of each leg 'a'. Triangle XYZ is a isosceles right triangle, therefore the Pythagoras theorem becomes and this can be evaluated by using properties of isosceles triangle.

According to the statement

we have given that a theorem and we have to prove it.

So, For this purpose,

The given information is :

Isosceles triangle XYZ where $Angle X = 45^{0}$ $Angle Y = 45^{0}$ $Angle Z = 90^{0}$

Let the sides of triangle XYZ be a, b, and c. Then side XY = c, YZ = b and ZX = a.

Now, it is given that triangle XYZ is isosceles triangle therefore, the shorter sides must be equal that is, a = b.

Now use Pythagoras theorem

$a^{2} + b^{2} = c^{2}$

But here a= b then the equation become

$a^{2} + a^{2} = c^{2}$

Then after solving it become

$2a^{2} = c^{2}$

And here we have to find the value of the hypotenuse,

so we solve it for c.

Then

$c = a\sqrt{2}$

From this it is clear that the

it can be concluded that the hypotenuse is times the length of each leg 'a'.

Learn more about Pythagoras theorem here

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1 year ago

Identify the sampling techniques used, and discuss potential sources of bias (if any). Explain. In 1965, researchers used ran

crimeas [40]

Answer:

For this case, the method used would be simple random sampling since random digit dialing assumes that all possible people in the population have the same probability of being chosen.

We may have a non-response bias, because if a selected person does not choose the phone, we have no answers to the questions and there is no data available.

We may also have under coverage bias because some people may not have a phone and in this case these people would be excluded from the study

Step-by-step explanation:

For this case is important to remember the different types of sampling methods

Simple random sampling is a method where we select a sample size n and each individual in the population are equally likely to be selected.

Stratified random sampling is a method on which we select samples from subgroups of the population usually called strata.

Convinience sampling is a method that use a random number so select the sample

Cluster sampling is a method that separates the population in natural subgroups with no intersection between them and some of the groups are selected for the sample.

For this case, the method used would be simple random sampling since random digit dialing assumes that all possible people in the population have the same probability of being chosen.

Sources of bias

We may have a non-response bias, because if a selected person does not choose the phone, we have no answers to the questions and there is no data available.

We may also have under coverage bias because some people may not have a phone and in this case these people would be excluded from the study

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3 years ago

Barry’s Bagel Emporium sells a dozen bagels for $5.00. This price is no longer high enough to create a profit. The owner decides

Andrew [12]

Plan B or plan D will be the fastest.

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3 years ago

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