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Lilit [14]
3 years ago
6

I need help...........​

Mathematics
2 answers:
m_a_m_a [10]3 years ago
6 0

Answer:

\frac{3}{4} & -\frac{4}{3}

Step-by-step explanation:

Negative reciprocals mean that the denominator (number on the bottom) and the numerator (number on the top) of the original number are swapped and is multiplied by -1.

gulaghasi [49]3 years ago
6 0

Answer:

4

3

& -\frac{4}{3}−

3

4

Step-by-step explanation:

I just need points

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Simplify 5 + 2{ x - 4[3 x + 7(2 - x )]}.
Afina-wow [57]

Answer:

34x - 107

Step-by-step explanation:


3 0
3 years ago
A 3x3 magic square contains each of the numbers 1-9 arranged in such a way that each row, column and diagonal add up to the same
BaLLatris [955]

3×3 magic square (square matrix) of each row, column and diagonal in part (a) add up to 15. part add up to 165 which is 11 times part (a) and part (c)add up to  0 which is 0 times part (a). we deduce this by using trial and error approach.

Part (a) solving it through trial & error method we get the 3×3 magic square (square matrix)

4 9 2

3 5 7

8 1 6

In part (a) the total of each row, column, and diagonal is 15

again taking the same approach of trial and error we get

(b)

54  59.2    52

53  55     57

58  51     56

In part (b) the total of each row, column, and diagonal is 165 which is 11 times more than the total of each row, column, and diagonal in part (a). it is because at the center of part (a) magic square ( square matrix), the number is 5 and at the center of part (b) magic square, the number is 55 which is 11 times that of part (a) magic square( square matrix). we know that the number at the center of a magic square( square matrix) is responsible to make it a magic square ( square matrix) as other numbers are placed according to the number at the center to provide balance.

(c)

-1 4.2 -3

-2 0 2

3 -4 1

In part (c) the total of each row, column, and diagonal is 0. because the digit at the center is zero. In part (c) the total of each row, column, and diagonal is 0 which is 0 times more than the total of each row, column, and diagonal in part (a). it is because at the center of part (a) magic square( square matrix) , the number is 5 and at the center of part (b) magic square( square matrix) , the number is 0 which is 0 times that of the part (a) magic square ( square matrix) when compared. we know that the number at the center of a magic square ( square matrix) is responsible to make it a magic square (square matrix) as other numbers are placed according to the number at the center to provide balance.

learn more about magic square and matrix here

brainly.com/question/16834893

#SPJ9

4 0
2 years ago
The SAT scores have an average of 1200 with a standard deviation of 60. A sample of 36 scores is selected. a) What is the probab
LiRa [457]

Answer:

a) 0.0082

b) 0.9987

c) 0.9192

d) 0.5000

e) 1

Step-by-step explanation:

The question is concerned with the mean of a sample.  

From the central limit theorem we have the formula:

z=\frac{\bar X-\mu}{\frac{\sigma}{\sqrt{n} } }

a) z=\frac{1224-1200}{\frac{60}{\sqrt{36} } }=2.40

The area to the left of z=2.40 is 0.9918

The area to the right of z=2.40 is 1-0.9918=0.0082

\therefore P(\bar X\:>\:1224)=0.0082

b) z=\frac{1230-1200}{\frac{60}{\sqrt{36} } }=3.00

The area to the left of z=3.00 is 0.9987

\therefore P(\bar X\:

c) The z-value of 1200 is 0

The area to the left of 0 is 0.5

z=\frac{1214-1200}{\frac{60}{\sqrt{36} } }=1.40

The area to the left of z=1.40 is 0.9192

The probability that the sample mean is between 1200 and 1214 is

P(1200\:

d) From c) the probability that the sample mean will be greater than 1200 is 1-0.5000=0.5000

e) z=\frac{73.46-1200}{\frac{60}{\sqrt{36} } }=-112.65

The area to the left of z=-112.65 is 0.

The area to the right of z=-112.65 is 1-0=1

5 0
3 years ago
What is 25/30 as a percent and decimal
torisob [31]
Solving 25 / 30 in percent.
25 / 30 * 100
= 25 / 3 *10
=250 / 3
= 83.3 Ans

Solving 25 / 30 in decimal
25 / 30
= 0.833 Ans
8 0
3 years ago
Read 2 more answers
Please help, If you can also explain the steps you used to solve this that would be great.
Darya [45]

Answer:

24¾

Step-by-step explanation:

8/18=11/x

x=11×18/8

x=198/8

x=24¾

7 0
3 years ago
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