Answer:
My age is 78 years.
Explanation:
Define my age first as a variable.
Let my age be  
x
 years.
Reduced by means subtracted.
Subtract twice my age from 400 to get 244:
400
−
2
x
=
244
400
−
244
=
2
x
      
←
 make x positive and isolate it.
156
=
2
x
78
=
x
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
2
x=40
 
Step-by-step explanation:
A triangle has 180 degrees and considering that triangle ABC is similar to DEF that means they have the same angle (A=D,B=E,C=F)
180=104 +36+x
180=140+x
180-140=x
40=×
 
        
             
        
        
        
Answer:
Step-by-step explanation:
Let q represent the number of quarters Theresa has. Then the value of her coins is ...
   0.25q + 0.10(20 -q) = 2.75
   0.15q = 0.75 . . . . . . . . . subtract 2.00, collect terms
   q = 0.75/0.15 = 5
Theresa has 5 quarters and 15 dimes.
 
        
             
        
        
        
Answer:
The answer is B: The area of the new rectangle is double it's original size
 
        
             
        
        
        
Hey there 
9a+3+2a+10
You have to collect like terms 
To simplify you have to add 9a and 2a. Then 3 and 10 
9a+2a= 11a 
10+3= 13 
The answer is 11a+13
hope this helps  <span />