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sergeinik [125]
1 year ago
14

Emma is building a scale model of a jet airplane. The real airplane has a wingspan of 200 feet and a length of 240 feet.

Mathematics
1 answer:
omeli [17]1 year ago
7 0

Answer:

it should be either a or b

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A package of self-sticking notepads contains 6 yellow, 6 blue, 6 green, and 6 pink notepads. An experiment consists of randomly
Rufina [12.5K]

Answer:

0.50

Step-by-step explanation:

Given that a package of self-sticking notepads contains 6 yellow, 6 blue, 6 green, and 6 pink notepads. An experiment consists of randomly selecting one of the notepads and recording its color

The probability that a green notepad is selected given that it is either blue or green is to be found out

Let A = event that selected notepad is green or blue

B = selected notepad is green

The probability that a green notepad is selected given that it is either blue or green is to be found out

= P(B/A)

=P(AB)/P(A)

=Prob (green)/P(green or blue)

= \frac{\frac{Green}{Total} }{\frac{Green+Blue}{Total} } \\=\frac{6/24}{12/24} \\=0.50

7 0
2 years ago
A jar contains sugar. The jar and the sugar have a total weight of 850 g. Anna uses 2/3 of the sugar. The jar and the sugar now
maria [59]

Answer:

J = 370g

Step-by-step explanation:

Given

Represent the weight of the Jar with J and the sugar with S

Initially, we have:

J + S = 850g

After 2/3 of sugar is removed we have:

J + S -\frac{2}{3}S= 530g

Required

Determine the weight of the jar

J + S = 850g --- (1)

J + S -\frac{2}{3}S= 530g --- (2)

Simplify (2)

J + S -\frac{2S}{3}= 530g

Take LCM

J + \frac{3S - 2S}{3}= 530g

J + \frac{S}{3}= 530g

Make S the subject in (1)

J + S = 850g

S = 850g - J

Substitute 850g - J for S in J + \frac{S}{3}= 530g

J + \frac{850g - J}{3}= 530g

Multiply through by 3

3 * J + 3*\frac{850g - J}{3}= 530g * 3

3J + 850g - J= 1590g

Collect Like Terms

3J  - J= 1590g-850g

2J= 740g

Make J the subject

J = \frac{1}{2} * 740g

J = 370g

<em>The jar weighs 370g</em>

5 0
2 years ago
Read 2 more answers
A recent survey by the American Automobile Association showed that a family of two adults and two children on vacation in the Un
masha68 [24]

Answer: We are given:

\mu=247,\sigma=60

We need to find the z scores for the following vacation expense amounts:

$197, $277, $310

We know that z score formula is:

z=\frac{x-\mu}{\sigma}

When x = 197, the z score is:

z=\frac{197-247}{60}

        =\frac{-50}{60}

        =-0.83

When x = 277, the z score is:

z=\frac{277-247}{60}

        =\frac{30}{60}

        =0.5

When x = 310, the z score is:

z=\frac{310-247}{60}

        =\frac{63}{60}

        =1.05

Therefore, the z scores for the vacation expense amounts $197 per day, $277 per day, and $310 per day are -0.83, 0.5 and 1.05 respectively


8 0
2 years ago
Read 2 more answers
Find c1 and c2 such that M2+c1M+c2I2=0, where I2 is the identity 2×2 matrix and 0 is the zero matrix of appropriate dimension.
Katyanochek1 [597]

The question is missing parts. Here is the complete question.

Let M = \left[\begin{array}{cc}6&5\\-1&-4\end{array}\right]. Find c_{1} and c_{2} such that M^{2}+c_{1}M+c_{2}I_{2}=0, where I_{2} is the identity 2x2 matrix and 0 is the zero matrix of appropriate dimension.

Answer: c_{1} = \frac{-16}{10}

             c_{2}=\frac{-214}{10}

Step-by-step explanation: Identity matrix is a sqaure matrix that has 1's along the main diagonal and 0 everywhere else. So, a 2x2 identity matrix is:

\left[\begin{array}{cc}1&0\\0&1\end{array}\right]

M^{2} = \left[\begin{array}{cc}6&5\\-1&-4\end{array}\right]\left[\begin{array}{cc}6&5\\-1&-4\end{array}\right]

M^{2}=\left[\begin{array}{cc}31&10\\-2&15\end{array}\right]

Solving equation:

\left[\begin{array}{cc}31&10\\-2&15\end{array}\right]+c_{1}\left[\begin{array}{cc}6&5\\-1&-4\end{array}\right] +c_{2}\left[\begin{array}{cc}1&0\\0&1\end{array}\right] =\left[\begin{array}{cc}0&0\\0&0\end{array}\right]

Multiplying a matrix and a scalar results in all the terms of the matrix multiplied by the scalar. You can only add matrices of the same dimensions.

So, the equation is:

\left[\begin{array}{cc}31&10\\-2&15\end{array}\right]+\left[\begin{array}{cc}6c_{1}&5c_{1}\\-1c_{1}&-4c_{1}\end{array}\right] +\left[\begin{array}{cc}c_{2}&0\\0&c_{2}\end{array}\right] =\left[\begin{array}{cc}0&0\\0&0\end{array}\right]

And the system of equations is:

6c_{1}+c_{2} = -31\\-4c_{1}+c_{2} = -15

There are several methods to solve this system. One of them is to multiply the second equation to -1 and add both equations:

6c_{1}+c_{2} = -31\\(-1)*-4c_{1}+c_{2} = -15*(-1)

6c_{1}+c_{2} = -31\\4c_{1}-c_{2} = 15

10c_{1} = -16

c_{1} = \frac{-16}{10}

With c_{1}, substitute in one of the equations and find c_{2}:

6c_{1}+c_{2}=-31

c_{2}=-31-6(\frac{-16}{10} )

c_{2}=-31+(\frac{96}{10} )

c_{2}=\frac{-310+96}{10}

c_{2}=\frac{-214}{10}

<u>For the equation, </u>c_{1} = \frac{-16}{10}<u> and </u>c_{2}=\frac{-214}{10}<u />

6 0
2 years ago
A candy store is building a display with two rectangular prism.The base of each prism is a square with an edge length of 5 inche
nordsb [41]
The volume of the display is 900 cubic inches.  

The formula for the volume of a prism is L x W x H. 

In the small shape, we have:  5 x 5 x 12 = 300
In the large shape, we have:  5 x 5 x 24 = 600

Add them together and we have 900 cubic inches.
8 0
2 years ago
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