How to solve number 21 :/

Answers

Answer 1

Answer: $\left(\begin{array}{cc}1&1\n-2&1\end{array}\right) \bold{M}= 2\left(\begin{array}{cc}1&0\n0&1\end{array}\right)\n \bold{M}=2\frac{ \left(\begin{array}{cc}1&0\n0&1\end{array}\right) }{ \left(\begin{array}{cc}1&1\n-2&1\end{array}\right)}\n \bold{M}=2\left(\begin{array}{cc}1&0\n0&1\end{array}\right) \left(\begin{array}{cc}1&1\n-2&1\end{array}\right)^(-1)$

$\left(\begin{array}{cc}1&1\n-2&1\end{array}\right)^(-1)=(1)/(1-(-2))\left(\begin{array}{cc}1&-1\n2&1\end{array}\right)\n\left(\begin{array}{cc}1&1\n-2&1\end{array}\right)^(-1)=(1)/(3)\left(\begin{array}{cc}1&-1\n2&1\end{array}\right)\n\left(\begin{array}{cc}1&1\n-2&1\end{array}\right)^(-1)=\left(\begin{array}{cc}(1)/(3)&-(1)/(3)\n(2)/(3)&(1)/(3)\end{array}\right)\n\n$
$\bold{M}= 2\left(\begin{array}{cc}1&0\n0&1\end{array}\right)\left(\begin{array}{cc}(1)/(3)&-(1)/(3)\n(2)/(3)&(1)/(3)\end{array}\right)\n\bold{M}= 2\left(\begin{array}{cc}(1)/(3)&-(1)/(3)\n(2)/(3)&(1)/(3)\end{array}\right)\n\bold{M}= \left(\begin{array}{cc}(2)/(3)&-(2)/(3)\n(4)/(3)&(2)/(3)\end{array}\right)$

Related Questions

I need help on this question please help?
Which tables contain correct pairs of input and output values for the function ? Select all the correct answers. Input (x) -1.6 0.4 2.2 3.7 Output f(x) -5.5 2.5 6.75 10.75 Input (x) -2.7 -1.3 0.8 4.4 Output f(x) -5.25 -1.75 3.5 12.5 Input (x) 1.1 2.4 5.3 6.9 Output f(x) 4.25 7.5 11.75 17.25 Input (x) -2.1 0.9 1.7 3.3 Output f(x) -3.75 3.75 5.75 9.75 Input (x) 2.4 3.5 4.6 5.0 Output f(x) 7.5 10.5 12.5 14
Given scalene right triangle with an acute angle of 65°.To the nearest tenth of a foot, determine the value of h. A. 1.7 B. 1.9 C. 3.6 D. 8.6
Add an explanation on how to get the right answer and I will give out Brainliest
What number is in the tenths place?123.456

There are 206 people find the percentage of 80 people

Answers

80 people out of 206 people.

$(80)/(206) = (40)/(103) \approx \boxed{\sf{39~percent}}$

Your answer is 39%.

Sandra used her debit card to buy lunch for $8.74 on Monday. On Tuesday, she deposited $8.74 back into her account. What is the overall increase or decrease in her bank account?

Answers

Answer:

$0$

Step-by-step explanation:

Money spent by Sandra on Monday to buy lunch using her debit card is $\$8.74$

Money deposited by Sandra into her bank on Tuesday is $\$8.74$

Difference of both transactions $8.74 - 8.74 = 0$

∴ Overall increase or decrease in Sandra's bank account after both transaction is $0$

i.e no overall increase or decrease in her bank account

-8.74 + 8.74 = 0....there is a 0 increase/decrease in her account

What is the y-intercept of the line with the equation 4x 2y = 12?

Answers

Hello,
I suppose it is 4x+2y=12

==>4*0+2y=12
==>y=6 and x=12-4*6=-12

Karyn proofread a 15 pages in 2 hours for $40.a. What is her proofreading rate per pages per hour?
b. How much does she receive on average per a page?

Answers

a. 8 pages per hour because 120 (2 hours) ÷15=8
b. $40÷15 (pages)=$2.70 (rounded)

A group of students is researching the music choices of America's high school students. To conduct the survey they take a poll at a high school in downtown New York City. Will the results of this survey give the researchers a good indication of the music choices of America's youth? Why or why not?A) Yes, students in New York City represent all of the students in the USA.
B) No, the students in the high school are not accustomed to being part of a survey.
C) Yes, students in New York City have the best taste in music so they would make a great sample group.
D) No, in order to get an accurate sample, researchers should survey students from various high schools in various states including urban, rural, public, and private.

Answers

No, in order to get an accurate sample, researchers should survey students from various high schools in various states including rural,urban,public and private

Final answer:

No, a survey conducted in a single high school in downtown New York City would not accurately represent the musical preferences of all American high school students. To get a representative sample, the survey would have to include diverse high schools across different states and environments.

Explanation:

You asked if a survey taken at a high school in downtown New York City would provide a good indication of the music choices of America's youth. The most accurate answer is D: No, in order to get an accurate sample, researchers should survey students from various high schools in various states including urban, rural, public, and private.

This is because a single high school in New York City cannot represent all the high school students in America. Music tastes can widely vary based on various factors such as geographical location, socio-economic background, cultural influences, etc. Therefore, to obtain a representative sample that can accurately reflect the music preferences of American high school students, it would be necessary to conduct a survey that includes a diverse range of high schools across different states and environments.