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irina [24]
3 years ago
7

Do number 7 and 8 please

Mathematics
1 answer:
Kruka [31]3 years ago
5 0

7) \sqrt[3]{64} = \sqrt[3]{4^3} = 4

8) \sqrt[3]{216} = \sqrt[3]{6^3} = 6

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Solve the system by elimination 1: x+5y-4z=-10, 2x-y+5z=-9, 2x-10y-5z=0 .. . 2. Solve the system by substitution: 2x-y+z=-4, z=5
Kryger [21]
1 )
1st and 2nd equation (multiply 1st by -2 ):
-2x - 10 y + 8 z = 20
2 x -  y    + 5 z = -9
---------------------------
       - 11 y + 13 z = 11  /  * ( -20 )
1st and 3rd:
- 2 x - 10 y + 8 z = 20
   2 x - 10 y - 5 z = 0
-----------------------------
         - 20 x + 3 z = 20  /  * 11
        ----------------------------------
         220 y - 260 z = -220
        - 220 y + 33 z = 220
        ------------------------------
                       z = 0,      y = -1,        x = - 5
2 )  
       2 x - y + 5 = -4
       - 2 x + 3 y - 5 = - 10
       Substitution: y = 2 x + 9
       - 2 x + 3(2 x + 9 ) = -5
        4 x = - 32,          x = -8,    y = -7,   z = 5
3 )
      x + y + z = 11
   1.5 x+3 y +1.5 z = 21
      x = 2 y
   ------------------------
      3 y + z = 11  / * (-2)
      6 y + 1.5 z = 21
    ------------------------
     - 6 y - 2 z = -22
       6 y + 1.5 z = 21
      ------------------------
                 -0.5 z = -1,           z = 2,   y = 3,   z = 6
Answer: the store used 6 pounds of peanuts, 3 pounds of almonds and 2 pounds of raisins. 
           
8 0
3 years ago
What does the missing number represent?
kenny6666 [7]

Answer: (C) the number of groups

Step-by-step explanation: It cannot be the total because the total is 18, the size of the groups does not make sense because it seems that you are trying to find a total, and the difference makes no sense because this does not seem like a subtraction problem. (C) the number of groups makes sense because their is a total number of groups.

Hope this helps! :)

6 0
3 years ago
Read 2 more answers
ON TIMER!!!
Anton [14]

Answer:

I'm sure it is 180 degrees

8 0
2 years ago
If you are adding two fractions that are both greater than one half what must be true about the sum?
Ann [662]
It will automatically be over 1
4 0
3 years ago
How many 2/3 cups servings are in a 4 cup container of food
tatyana61 [14]
2/3×4= 2 2/3
the answer is 2 cups container of food
6 0
3 years ago
Read 2 more answers
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