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kaheart [24]
3 years ago
8

Mathematics I need help please

Mathematics
1 answer:
mel-nik [20]3 years ago
7 0
5 1/7 x 1/9= 36/7 ×1/9= 4/7

8-3/2= 8-1 1/2= 7 1/2
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Solve the following system of equations for all three variables.
nignag [31]
  5x - 2y + 1z = 8 ⇒   5x - 2y + 1z = 8
-9x + 2y + 2z = 5 ⇒ -9x + 2y + 2z = 5
-9x -  2y -  5z = 4             -4x + 3z = 13

 5x -  2y + 1z = 8
-9x + 2y + 2z = 5 ⇒ -9x + 2y + 2z = 5
-9z -  2y -  5z = 4 ⇒ -9x -  2y -  5z = 4
                                        -18x - 3z = 9

     -4x + 3z = 13
    -18x - 3z =   9
           -22x = 22
            -22    -22
                x = -1
    -18x - 3z = 9
-18(-1) - 3z = 9
       18 - 3z = 9
     - 18       - 18
             -3z = -9
              -3     -3
                z = 3

    5x - 2y + z = 8
5(-1) - 2y + 3 = 8
     -5 - 2y + 3 = 8
     -2y - 5 + 3 = 8
           -2y - 2 = 8
                + 2 + 2
                -2y = 10
                 -2     -2
                   y = -5
          (x, y, z) = (-1, -5, 3)
6 0
3 years ago
How would you correctly write the equation 4(10+5)=6(12-2) using the distributive property?
slamgirl [31]

the correct answer is 45=70

3 0
3 years ago
1 and two-thirds minus 2 and one-third
svetoff [14.1K]

Answer:

The answer is -2/3.

Hope this helps and if you could mark as brainliest. Thanks!

4 0
3 years ago
Read 2 more answers
Can each pencil have a mass of 10.5 grams in a pack of 5 pencils weighing 60 to 95 grams?
kvasek [131]
I don't know if I'm right, but if each pencil is 10.5 grams then you multiply it by 5 ( number of pencils) and you get 52.5, which would not meet the standards of a pack weighing 60 to 95 grams.
8 0
3 years ago
Some animals on farms eat hay to get energy. A horse can eat twenty pounds of hay each day. Write and evaluate an expression to
dangina [55]

Answer:

B

Step-by-step explanation:

20pounds/day * 14days * 20horses

7 0
3 years ago
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