Answer:
The twins would be 13 years old. 
Step-by-step explanation:
21+21+21+13+13 = 89
 
        
                    
             
        
        
        
Answer:
g = 10
Step-by-step explanation:
Distribute 7 to the parentheses:
7(g + 5) = 105
7g + 35 = 105
Solve for g:
7g + 35 = 105
7g = 170
g = 10
So, the answer is g = 10
 
        
                    
             
        
        
        
Answer:
the interest is 960.
Step-by-step explanation:
the formula: I=prt    i=interest p= pricipal [the money you start with]
r= rate t= time
I=?                                                     I= 800 (0.02) (10)
P= $800                                           I= 160+ 800 {because $160 is added}
R= 2% --> 0.02 [as a decimal]         I= $960
T= 10 years
 
        
             
        
        
        
Answer:
30 mins = 0.5 hours
4.5 miles/0.5 hours = your answer
Step-by-step explanation: