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3 years ago

50 POINT QUESTION Are matrices A and B inverses?

Mathematics

2 answers:

MrRa [10]3 years ago

8 0

Answer:

Step-by-steYes, they are.

plug matrices into calculator and find the inverse.

Inverse of matrices:

plug matrix into calculator

second matrix

edit

second quit

second matrix

press A

press x^ -1

enterp explanation:

Andreyy893 years ago

4 0

Yes, they are.
plug matrices into calculator and find the inverse.
Inverse of matrices:
plug matrix into calculator
second matrix
edit
second quit
second matrix
press A
press x^ -1
enter

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Using the Multiplication Property of -1

Papessa [141]

A. -(a+5)

Because the negative sign is outside the parenthesis, multiplying by -1 just removes the negative sign:

-(a+5) * -1 = a+5

B. -(-x+31)

Apply the distributive property:

-(-x+31) becomes (- -x +31) which simplifies to (x+31)

multiply that by -1 to get -x+31

C. -(4x+12)

Because the negative sign is outside the parenthesis, multiplying by -1 just removes the negative sign:

-(4x+12) * -1 = 4x+12

7 0

3 years ago

A statistics instructor believes that fewer than 20% of Evergreen Valley College (EVC) students attended the opening night midni

Alex17521 [72]

Answer: It is believed that exactly 20% of Evergreen Valley college students attended the opening night midnight showing of the latest harry potter movie.

Step-by-step explanation:

Since we have given that

n = 84

x = 11

So, $\hat{p}=\dfrac{x}{n}=\dfrac{11}{84}=0.13$

p = 0.20

So, hypothesis:

$H_0:p=\hat{p}\\\\H_a:\hat{p}$

so, test statistic value would be

$z=\dfrac{\hat{p}-p}{\sqrt{\dfrac{p(1-p)}{n}}}\\\\z=\dfrac{0.13-0.20}{\sqrt{\dfrac{0.2\times 0.8}{84}}}\\\\z=-1.604$

At 1% level of significance, critical value would be

z= 2.58

Since 2.58>-1.604

So, We will accept the null hypothesis.

Hence, It is believed that exactly 20% of Evergreen Valley college students attended the opening night midnight showing of the latest harry potter movie.

4 0

3 years ago

Read 2 more answers

I need help with this plz

jeka94

Answer:

Triangle CED

Step-by-step explanation:

C and M need to both be at the same places in their respective equations.

4 0

2 years ago

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