Answer:
decimal: x0.6 or fraction: 2/3
Step-by-step explanation:
 
        
             
        
        
        
3x-13=2
move -13 to the other side
sign changes from -13 to +13
3x-13+13=2+13
3x=2+13
3x=15
divide both sides by 3 to get x by itself
3x/3=15/3
cross out 3 and 3, divide by 3 and then becomes 1*1*x=x
x=15/3
x=5
answer:
x=5
 
        
             
        
        
        
Answer:
Step-by-step explanation:
Use the equation
89 < 75 + 0.7*M                Subtract 75 from both sides
89 - 75 < 0.7M                  Combine
14 < 0.7 M                          Divide both sides by 0.7
14/0.7 < M
20 < M
If M goes over 20 then the flat rate is cheaper. 
 
        
             
        
        
        
Answer:
34.54 
Step-by-step explanation:
According to the scenario, computation of the given data are as follows,
Height (h) = 3.7 km
Base radius (r) = 3 km
We can calculate the volume of mountain by using following formula, 
So, volume of cone = (1/3)π h
h
By putting the value in the formula, we get
= (1/3) π ×  × 3.7
 × 3.7
= 11.1π
= 34.54 
Hence, the volume of the mountain is  34.54  .
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