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Anon25 [30]
3 years ago
10

I need help what goes in the box I need help ASAP ..

Mathematics
1 answer:
Reika [66]3 years ago
6 0

Answer:

ion kno

Step-by-step explanation:

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If A = [
Vlada [557]

Answer:

Hello,

Step-by-step explanation:

a)

A=\begin{bmatrix}-4 & 2 \\3 & -7 \end{bmatrix}\\\\|A|=det \ A=-4*(-7)-3*2=28-6=22\\\\

b)

Adj\ A= \begin{bmatrix}-7 & 3 \\2 & -4 \end{bmatrix}\\

c)

A^{-1}=\begin{bmatrix}\dfrac{-7}{22}  & \dfrac{2}{22}  \\\\\dfrac{3}{22}  & \dfrac{-4}{22}  \end{bmatrix}

d) Since A has an inverse, A is inversible and <u>not singular.</u>

5 0
2 years ago
A 12 ounce soda costs $1.25 in the vending machine. At this rate, how much would a 32 ounce soda cost
pochemuha

Answer:

3.75

Step-by-step explanation:

1.25 times 3

5 0
3 years ago
Read 2 more answers
Two standardized​ tests, a and​ b, use very different scales of scores. the formula upper a equals 40 times upper b plus 50a=40×
Romashka [77]

Answer:

(a) The mean score of test A is 1210.

(b) The mean score of test A is 1210.

(c) The standard deviation of  test A is 80.

(d) The value of Q₃ for test A is 1170.

(e) The value of median for test A is 1090.

(f) The value of IQR for test A is 290.

Step-by-step explanation:

The relation between two standardized tests <em>A</em> and <em>B</em> is:

50A=40B+50

The equation above approximates the relationship between scores on the two tests.

The summary statistics for test B are as follows:

Lowest Score = 21

Mean score = 29

Standard deviation = 2

Q₃ = 28

Median = 26

IQR = 6

(a)

Compute the lowest score on test A as follows:

A=40B+50\\=(40\times21)+50\\=890

Thus, the lowest score on test A is 890.

(b)

Compute the mean score of test A as follows:

<h2>A=40B+50\\=(40\times29)+50\\=1210</h2>

Thus, the mean score of test A is 1210.

(c)

Compute the mean score standard deviation of test A as follows:

<h2>A=40B+50\\=(40\times2)\\=80</h2>

Thus, the standard deviation of  test A is 80.

(d)

Compute the value of Q₃ for test A as follows:

A=40B+50\\=(40\times28)+50\\=1170

Thus, the value of Q₃ for test A is 1170.

(e)

Compute the value of median for test A as follows:

A=40B+50\\=(40\times26)+50\\=1090

Thus, the value of median for test A is 1090.

(f)

Compute the value of IQR for test A as follows:

A=40B+50\\=(40\times6)+50\\=290

Thus, the value of IQR for test A is 290.

6 0
3 years ago
Can someone help me thanks
Helga [31]

Answer:

-142

Step-by-step explanation:

So we have the function:

f(x)=-x^2-9x+20

To find f(9), substitute x for 9:

f(9)=-(9)^2-9(9)+20

Square the first term and multiply the second:

f(9)=-81-81+20

Add:

f(9)=-142

And that's our answer :)

7 0
3 years ago
Read 2 more answers
when mattie rents a car for one day , the cost is $29.00 plus $0.20 a mile. on her last trip , mattie paid $66.40 for the one da
weqwewe [10]

Answer:

Step-by-step explanation:

4 0
3 years ago
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