Let x be for unknown number. Let x be first number .
X+1 To be second number .x+2be third number.  X+(x+1)+(x+2)=312.
Simplify to get 3x+3=312 . Subtract 3 from both sides 3x-3=312-3. Once you subtract get 3x=109.then divide 3 both sides . 3x/3=309/3. To get x= 103.  
Now once you have that  First number 103. Second number 103+1=104 . And third number 103+2=105.    To check add them 103+104+105=312
 
        
             
        
        
        
Answer:
x < -10.5
Step-by-step explanation:
list the integers that satisfy both these inequalities, 2x+9 <-12
Subtract 9 from  both sides;
2x +9 - 9 < -12-9
2x < -21
x < -21/2
x < -10.5
<em>Hence all the integers are values of x less than 10.5</em>
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Answer:
they will make $33,800 in a year.
Step-by-step explanation:
there are 52 weeks in a year, so $650×5= $33,800
 
        
             
        
        
        
Answer:
angles 3, 1, 7, 5
Step-by-step explanation:
suplementary angles add up to 180 degrees so 
 <4 + <3=180
<4 + <1 =180
<4 + <7=180
<4 + <5= 180