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Phoenix [80]
3 years ago
8

Armando read 20 pages of his 200-page book in 4 hours. At this rate, how long will it take him to read the entire book?

Mathematics
1 answer:
Jet001 [13]3 years ago
6 0
What you would need to do is find out how many pages can he read in 1 hour. If he can read 20 pages in 4 hours, then that means he can read 5 pages in 1 hour. So, what you need to do is divide 5 by 200, and you'll get 40. Armando will finish the whole book in 40 hours.
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Matrix multiplication was used to encode a message using the given encoding matrix: [i 47 A=1 |-1 -3] The original message was c
nadya68 [22]

Answer:

A^{-1}=\left[\begin{array}{cc}-3&-4\\1&1\end{array}\right] message SHOW_ME_THE_MONEY_  

Step-by-step explanation:

The matrix

A=\left[\begin{array}{cc}1&4\\-1&-3\end{array}\right]\rightarrow |A|=(1 \times -3)-(-1\times 4)=1\\\rightarrow A^{-1}=\left[\begin{array}{cc}-3&-4\\1&1\end{array}\right] \\

We can check that in fact A*A^⁻1=I_2 the identity matrix of size 2 x 2.

Now the message was divided in 1 x 2 matrices, then we have that the sequence given is the result of multiplying m by A, so to get m again we multiply now by A^⁻1. and we get the next table

Encoded message    Decoded message    message in letters by association

11 52        19 8    S H

-8 -9         15 23  O W

-13 -39        0 13   _ M

5 20         5 0   E _

12 56        20 8    T H

5 20         5 0    E _

-2 7           13 15  M O

9 41         14 5   N E

25 100       25 0    Y _

Then the message decoded is SHOW_ME_THE_MONEY_                                

3 0
3 years ago
(please help me)
Jobisdone [24]

Answer:

8/14

Step-by-step explanation:

there are 5 odd numbers and 3 numbers are coloured red

7 0
2 years ago
You drive 4 miles from your house to your friend's house. Your house is at an elevation of 622 feet. Your friend's house is at a
ANEK [815]
Just subtract 622 feet from 486 feet to get the change in elevation.  The result will be negative because your friend's house is at a lower elevation than yours.

Now find the mean change in elevation per mile by dividing (486 ft - 622 ft) by 4 miles:
                      -136 ft
                    -----------  = -34 ft/mile
                       4 mi
8 0
3 years ago
an art student wants to take a triangle with side lengths of 9,9, and 15 and enlarge it so that the longest side of a new triang
VikaD [51]

Answer:

13.5

Step-by-step explanation:

The longest side of the smaller triangle is 15 while that of the bigger one is 22.5

The enlargement ratio is 22.5/15 = 1.5

so the lengths of the smaller sides will be;

(1.5*9) = 13.5

6 0
3 years ago
Find two numbers whose sum is 64 and whose difference is 42
vovangra [49]
These numbers are  "a"  and "b".  
Sum is 64,  so  a+b=64
Difference  is 42  so  a-b=42
So you've got:
+\begin{cases} a+b=64 \\ a-b=42\end{cases} \\ \overline{, \quad2a \quad \ = \ 106} \qquad /:2 \\ a=53
When a+b=64 and a=53  you've got:
53+b=64
b=11

So these numbers is 53 and 11. 

4 0
3 years ago
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