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Katen [24]
2 years ago
9

D%20%29%20%7B%7D%5E%7B2%7D%20" id="TexFormula1" title="( \frac{10 \sqrt{3} }{ \sqrt{5} } - \sqrt{15} ) {}^{2} " alt="( \frac{10 \sqrt{3} }{ \sqrt{5} } - \sqrt{15} ) {}^{2} " align="absmiddle" class="latex-formula">
​
Mathematics
1 answer:
andrew-mc [135]2 years ago
5 0

Answer:

2

Step-by-step explanation:

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The matrix C=[1,-2_-3,7] was used to encode a phrase to [7,-28,-25,-35,-2_-21,107,90,123,17]. Find C^-1 and use it to decode the
posledela
C=  \left[\begin{array}{cc}1&-2\\-3&7\end{array}\right]  \\ C^{-1}= \left[\begin{array}{cc}7&2\\3&1\end{array}\right]  \\ \left[\begin{array}{cc}7&2\\3&1\end{array}\right] \times   \left[\begin{array}{ccccc}7&-28&-25&-35&-2\\-21&107&90&123&17\end{array}\right]  \\ =\left[\begin{array}{ccccc}49-42&-196+214&-175+180&-245+246&-14+34\\21-21&-84+107&-75+90&-105+123&-6+17\end{array}\right] \\ =\left[\begin{array}{ccccc}7&18&5&1&20\\0&23&15&18&11\end{array}\right]
is the required matrix.
6 0
2 years ago
The length of a rectangle is 3 times the width. The perimeter is 44 cm. What are the dimensions of the rectangle? Write and solv
ser-zykov [4K]
Here are your equations:
x and 3x
How to set up:
2(x)+ 2(3x) = 44
Simplify:
8x = 44
Divide:
x = 5.5
Plug back in to find values:
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Hope this helps!! :)
5 0
3 years ago
1. (4x2 – 2x+8)+(x² + 3x - 2)
krek1111 [17]

Answer:

I   simplify  it and got 5x^2+z+6

Step-by-step explanation:

(4x2 – 2x+8)+(x² + 3x - 2)v=5x^2+z+6

4 0
3 years ago
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On average, Makenzie runs 4 miles in 50 minutes. How fast should she plan to run a 10-mile race if
pishuonlain [190]

Answer: A

Step-by-step explanation:

The easiest way to solve this problem would to first figure out how long it takes for Mak to run 1 mile. To do that, you would need to divide 50 by 4 which would give you 12.5. So, it takes Mak 12 and a half minutes to run 1 mile. From there, you would need to multiply 12.5 by 10 to get 125. Finally, you wold need to simplify 125 minutes to hours giving you 2 hours and 5 minutes.

5 0
2 years ago
Kelly has 7 days to read 60 pages of a book for school. She plans to read 8 pages a night for 6 nights.What percent of the assig
dimaraw [331]

Answer:

20 percent left

Step-by-step explanation:

3 0
2 years ago
Read 2 more answers
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