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3 years ago

Two hundred students were polled on their preferred theme for prom. Find the approximate value of the chi-square test statistic.

Mathematics

1 answer:

Kamila [148]3 years ago

3 0

Answer:

8.37

Step-by-step explanation:

dont know but i know this is correct!

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Liliana wants to determine the height of an enlarged photo that she plans to frame. The original photo was 11 inches wide by 14

vova2212 [387]

For this case, the first thing we must do is find the scale factor.

For this, we use one of the dimensions. We will use the width of the photo.

We have then:

$k = \frac {132} {11}\\k = 12$

Then, we look for the value of the height of the new photo. To do this, we multiply the scale factor by the original dimension.

We have then:

$14k = 14 (12) = 168$

Answer:

the new height will be:

d.168 inches

6 0

3 years ago

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What is the splitting of an atom called?

Marysya12 [62]

Answer:

fission

hope this helps (:

7 0

3 years ago

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1. Write a quadratic function, in standard form, that fits the set of points. Solve it as a system of three equations

sasho [114]

Answer:

The equation is $y=2x^2+4x-7$

Step-by-step explanation:

Let the quadratic function be

$y=ax^2+bx+c$

The point (-4,9) must satisfy this function,

$\Rightarrow a(-4)^2+b(-4)+c=9$

$\Rightarrow 16a-4b+c=9...(1)$

The point (0,-7) must also satisfy this function,

$\Rightarrow a(0)^2+b(0)+c=-7$

$\Rightarrow c=-7...(2)$

The point (1,-1) must also satisfy this function,

$\Rightarrow a(1)^2+b(1)+c=-1$

$\Rightarrow a+b+c=-1...(3)$

We put equation 2 into equation 1 to get;

$\Rightarrow 16a-4b-7=9$

$\Rightarrow 16a-4b=16$

$\Rightarrow 4a-b=4...(5)$

We again put equation 2 into equation 3 to get;

$\Rightarrow a+b-7=-1$

$\Rightarrow a+b=6...(6)$

We add equation 5 and 6 to get;

$5a=10$

$\Rightarrow a=2$

We put $a=2$ into equation 6 to get;

$2+b=6$

$\Rightarrow b=6-2$

$\Rightarrow b=4$

The equation is therefore $y=2x^2+4x-7$

5 0

3 years ago

A 12 foot ladder is leaning up against the side of a house the ladder makes an angle of 62° with the ground. How far up the side

Veseljchak [2.6K]

Answer:

Step-by-step explanation:

The ladder forms a right angle triangle with the house and the ground. The length of the ladder represents the hypotenuse of the right angle triangle. The height, h from the top of the ladder to the base of the house represents the opposite side of the right angle triangle.

The distance from the bottom of the ladder to the base of the house represents the adjacent side of the right angle triangle.

To determine the height, h that the ladder reaches, we would apply

the Sine trigonometric ratio.

Sin θ = opposite side/hypotenuse. Therefore,

Sin 62 = h/12

h = 12Sin62

h = 12 × 0.8829

h = 10.6 feet

4 0

3 years ago

2. Gabby, the teller, counted

nika2105 [10]

Answer:

https://answers.yahoo.com/question/index?qid=20100709054241AAMrcI7

Step-by-step explanation:

look at this website!

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3 years ago

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