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serg [7]
3 years ago
11

What is the value of the expression below when y=9 and z=3? 10y−7z

Mathematics
2 answers:
tiny-mole [99]3 years ago
6 0

10y−7z

Plug in the numbers for y and z.

(10)(9)−(7)(3)

= 69

aev [14]3 years ago
5 0

Answer:

69

Step-by-step explanation:

10y-7z

<u>Plug in y and z</u>

10(9)-7(3)

<u>Solve using order of operations</u>

90-21=69

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Step-by-step explanation:

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What is the missing length?
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Answer:  13.722 km ;  or, write as:  13  13/18 km .
___________________________________________________
Explanation:
___________________________________________________
Area = Length * width ; 
___________________________________________________
or, write as:  A = L * w ;
________________________

Given: A = 247 km² ; 
           
          L = 18 km ; 
 
          w = "y" ; 
________________________
 Find:  "y"
______________________________
  A = L * w ; 
______________________________
Plug in our values:
______________________________
  247 km² = 18 km * "y" ;  solve for "y" (in units of "km") ;

_____________________________
        18 y = 247 ; 
___________________________________________________________
Divide each side of the equation by "18"; to isolate "y" on one side of the equation; and to solve for "y" :
___________________________________________________________
        18 y / 18 = 247 / 18 ;
_____________________________________________
  to get:
_____________________________________________
              y = 13.7222222222222222...... km ;  round to: 13.722 km

                   or;  y = 13  13/18 km .
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3 0
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