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3 years ago

Which of the answer choices are equations? Select all that apply.

Mathematics

1 answer:

Radda [10]3 years ago

3 0

B and C are both equations because they both have equal signs.

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Nancy is having a movie night party at her house. She wants to share popcorn in two shapes, but she wants the shape which can ho

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A cone because it is can hold more

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3 years ago

Two quantities are related, as show in the table^. Which equation BEST represents the relationship.

wel

Well, there's a lot of ways you could do this. Because it's multiple choice, you can just pick a pair of points and whatever equation it works in, that's your answer. In this case, it's the third one down.

If you didn't have multiple choice you would use these two formulas:

m = (y2 - y1)/(x2-x1)

y - y1 = m (x - x1)

3 0

3 years ago

Suppose that you were not given the sample mean and sample standard deviation and instead you were given a list of data for the

Troyanec [42]

Answer:

So, the sample mean is 31.3.

So, the sample standard deviation is 6.98.

Step-by-step explanation:

We have a list of data for the speeds (in miles per hour) of the 20 vehicles. So, N=20.

We calculate the sample mean :

$\mu=\frac{19 +19 +22 +24 +25 +27 +28+ 37 +35 +30+ 37+ 36+ 39+ 40+ 43+ 30+ 31+ 36+ 33+ 35}{20}\\\\\mu=\frac{626}{20}\\\\\mu=31.3$

So, the sample mean is 31.3.

We use the formula for a sample standard deviation:

$\sigma=\sqrt{\frac{1}{N-1}\sum_{i=1}^{N}(x_i-\mu)^2}$

Now, we calculate the sum

$\sum_{i=1}^{20}(x_i-31.3)^2=(19-31.3)^2+(19-31.3)^2+(22-31.3)^2+(24-31.3)^2+(25-31.3)^2+(27-31.3)^2+(28-31.3)^2+(37-31.3)^2+(35-31.3)^2+(30-31.3)^2+(37-31.3)^2+(36-31.3)^2+(39-31.3)^2+(40-31.3)^2+(43-31.3)^2+(30-31.3)^2+(31-31.3)^2+(36-31.3)^2+(33-31.3)^2+(35-31.3)^2\\\\\sum_{i=1}^{20}(x_i-31.3})^2=926.2\\$

Therefore, we get

$\sigma=\sqrt{\frac{1}{N-1}\sum_{i=1}^{N}(x_i-\mu)^2}\\\\\sigma=\sqrt{\frac{1}{19}\cdot926.2}\\\\\sigma=6.98$

So, the sample standard deviation is 6.98.

3 0

3 years ago

Please answer it's about markups and markdowns question you will get brainliest if you get it right

aliya0001 [1]

Adina did not simply. Before multiplying 5.

4 0

3 years ago

Y is directly proportional to x^2, if y=9 when x=3, find: a) the constant of proportionality.

Gekata [30.6K]

Answer:

k = 1

Step-by-step explanation:

=> y ∝ x²

So, y = kx² ----------------------------(1)

<u><em>Where k is the constant of proportionality</em></u>

Now,

y = 9 when x = 3

Putting in (1)

=> 9 = k(3)²

=> 9 = k(9)

Dividing both sides by 9

=> k = 1

5 0

3 years ago