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4 years ago

Identify each matrix A such that A^2 has identical diagonal elements?

Mathematics

1 answer:

Maksim231197 [3]4 years ago

6 0

Answer:

The correct matrices are:

Matrix:

7 1 5

1 5 7

5 7 1

all diagonal elements of A^2 are: 7^2 + 1^2 + 5^2

Matrix:

9 18 27

27 -9 18

18 27 9

all diagonal elements of A^2 are: 9^2 + 27*18 + 18*27 or (-9)^2

Matrix:

8 1 6

6 8 1

1 6 8

all diagonal elements of A^2 are: 8^2 + 6*1 + 1*6

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Cat weighs 29.5 pounds ,Drees dog waits 33 pounds what is the differents in oz between Audrey dog and the cat

Greeley [361]

Answer:

56 oz

Step-by step explanation:

The difference is 3.5 pounds

There are 16oz in 1 pound

16x3.5=56oz

5 0

3 years ago

What is 9/11 +2/3 and show the work

erica [24]

Answer:

9/11 = 27/33

2/3 = 22/33

27/33 + 22/33 = 49/33

Step-by-step explanation:

7 0

3 years ago

Read 2 more answers

Think about a population proportion that you may be interested in and propose a confidence interval problem for this parameter.

o-na [289]

Answer: The confidence interval would be (0.2928,0.3672).

Step-by-step explanation:

Since we have given that

Total number of vehicles = 432

Number of SUVs sold = 142

So, it becomes,

$\hat{p}=\dfrac{x}{n}=\dfrac{142}{432}=0.33$

At 90% confidence interval,

z = 1.645

So, the confidence interval would be

$\hat{p}\pm z\sqrt{\dfrac{\hat{p}(1-\hat{p})}{n}}\\\\=0.33\pm 1.645\sqrt{\dfrac{0.33\times 0.67}{432}}\\\\=0.33\pm 0.0372\\\\=(0.33-0.0372,0.33+0.0372)\\\\=(0.2928,0.3672)$

Hence, the confidence interval would be (0.2928,0.3672).

8 0

3 years ago

An investor has an account with stock from two different companies. Last year, her stock in Company A was worth $6750 and her st

pantera1 [17]

Answer:

3.5%

Step-by-step explanation:

1. calculate starting total

$6750 + 4210=10960$

starting amount = $10,960

2. calculate stock A2's value

decreased by 18%

to make the percentage usable in this equation we need to divide it by 100 to get it in decimal form. ⇒ $\frac{18}{100} = 0.18$

multiply stock A1 by perctage decimal to get the amount decreased

$6750(0.18)=1215$ ($1,215)

subtract stock A1 by decreased amount to get stock A2's value

$6750-1215=5535$

A2 = $5,535

3. calculate stock B2's value

increased by 20%

to make the percentage usable in this equation we need to divide it by 100 to get it in decimal form. ⇒ $\frac{20}{100} = 0.20$

multiply stock B1 by perctage decimal to get the amount increased

$4210(0.20)=842$ ($842)

add stock B1 with increased amount to get stock B2's value

$4210+842=5052$

B2 = $5,052

4. get new amount of account

$5052+5535=10587$

new amount = $10,587

5. find percentage decrease of starting amount to new amount

divide starting amount by the new amount

$\frac{10960}{10587} = 1.03523188816$

then subtract by 1

$1.03523188816-1 =0.03523188816$

multiply by 100 to convert to percentage form

$0.03523188816(100) =3.523188816$

and round to <u>nearest tenth</u>

answer is ≈ 3.5%

::: (\_(\ Hope

*: (=' :') this

•.. (,('')('') helped :)

4 0

2 years ago

David has 75 arcade tokens each arcade game at dave and busters costs 5 tokens which inequality matches this scenario

lys-0071 [83]

Answer:

≤

Step-by-step explanation:

Note that

> means greater than

< means less than

≥ means greater than or equal to

≤ less than or equal to

David has a total of 75 tokens and Dave and busters costs 5 tokens per game. David cannot spend more than a total of 75 tokens, thus a less than or equal to sign would be used

5g ≤ 75

where g = total games than can be played

7 0

3 years ago