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3 years ago

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

Mathematics

1 answer:

Maksim231197 [3]3 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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Which number line shows the solution set for |y-9| <12

RUDIKE [14]

Answer:

Option c

$y\geq-3$ or $y \leq 21$

Step-by-step explanation:

The absolute value is a function that transforms any value x into a positive number.

Therefore, for the function $f(x) = |x|$ x> 0 for all real numbers.

Then the inequation:

$|y-9| \leq 12$ has two cases

$(y-9)$ if $y \geq 9$ (i)

$-(y-9)$ if $y < 9$ (ii)

We solve the case (i)

$y \leq 9 + 12\\y\leq21$

We solve the case (ii)

$-y +9 \leq 12\\-y \leq 12-9\\y \geq -3$

Then the solution is:

$y\geq-3$ or $y \leq 21$

8 0

3 years ago

X-2y=5 2x-4y=10

Nitella [24]

Step-by-step explanation:

X-2y=5 ; 2x-4y=10

• x - 2y = 5 • 2x -4y = 10

-2y = -x+5 -4y= -2x +10

y1 = ½x - 5/2 y2 = ½x -5/2

• => y1 = y2

½x -5/2 = ½x -5/2

the systems have no solution

• graph as attached

8 0

3 years ago

The sales tax in your city is 8.8\%8.8%, and an item costs \$63$63 before tax. How much tax would you pay on that item? Round to

Vlad1618 [11]

8.8%= .088

.088 *63=5.54
$5.54

7 0

3 years ago

2+2<br> Show your work and the first answer gets a brainliest

bazaltina [42]

Answer:

Four/4

Step-by-step explanation:

Add both numbers together.

2+2

8 0

3 years ago

A rubber ball has a diameter of 5cm and a bell takes up 12% of the rubber ball volume what is the diameter of the bell

musickatia [10]

0.6cm or 6mm if you take 5*12% you can get the answer pretty easy :)

I would appriciate Brainliest!

8 0

3 years ago

Read 2 more answers