Answer:
Gabe needs 20 liters of the 40% solution.  
He also needs 40 liters of the 70% solution. 
Step-by-step explanation:
Equation:
acid + acid = acid
0.40x + 0.70(60-x) = 0.60*60
40x + 70*60 - 70x = 60*60
-30x = -10*60
x = 20 liters
Gabe needs 20 liters of the 40% solution.  
He also needs 40 liters of the 70% solution. 
 
        
             
        
        
        
Using derivatives, it is found that the correct option is:
A. Object C has an acceleration that is greater than the acceleration for D.
The acceleration is the <u>derivative of the velocity</u>, given by change in velocity divided by change in time, that is:

In this problem:
- The change in time for objects C and T is the same.
- The <u>change in velocity for object C is greater</u>, thus, it has a greater acceleration, and the correct option is:
A. Object C has an acceleration that is greater than the acceleration for D.
A similar problem is given at brainly.com/question/14516604
 
        
                    
             
        
        
        
first off let's convert the mixed fractions to improper fractions.

she already did half a hat, so we can say   
so she only needs enough fabric to make 3 more full hats, we know each one uses 9/7 ft, so

 
        
             
        
        
        
1: 64
2: 59
3: 49
A triangle should always add up to 180 degrees. So just add up the angles you have and subtract them from 180