Answer:
It should be D.
Step-by-step explanation:
 
        
             
        
        
        
1.5 hours=90 minutes
Because 90 minutes/ 30 minutes is 3, multiply 3.6 miles by 3 and get 10.8 miles as your final answer
        
             
        
        
        
The second leftover expression is not o(a+b). It is 6(a + b). I have attached the correct question to depict that. 
Answer:
The equivalent expressions are;
8a + 2 and 6a + 6b
Step-by-step explanation:
The two leftover expressions are given as;
2(4x + 1) and 6(a + b)
In algebra, equivalent expressions are simply those expressions which when simplified, give the same resulting expression as the initial one. 
Thus simply means expanding or collecting like times to make it clearer. 
Now, in our question, like terms have already been collected. This means that to find an equivalent expression, we will just expand the bracket. 
Thus;
2(4x + 1) will be expanded by using the 2 outside the bracket to multiply the terms inside the bracket. This gives;
8x + 2
Similarly, 
6(a + b) will be expanded by using the 2 outside the bracket to multiply the terms inside the bracket. This gives;
6a + 6b
Thus;
The equivalent expressions are;
8a + 2 and 6a + 6b
 
        
             
        
        
        
Answer:
5
Step-by-step explanation:
Let L be the larger number and s be the smaller one.
Then we have two equations.
(1) L – s = 25
(2)       s = L/6     Multiply both sides by 6
         6s = L         Substitute the value for L in Equation(1)
  6s – s = 25        Combine like terms
        5s = 25        Divide both sides by 5
          s = 5
The value of the smaller number is 5.
 
        
             
        
        
        
2 ^ (3/5)
 the 3is the power and the 5 is the root
Choice D