Answer:
25% or 30L
Step-by-step explanation:
100% is 120L, we know 75% is acid, we need the other 25% to make the 100%. 25% of 120 is 30, so 30 liters is pure acid
 
        
             
        
        
        
So, h(t) is how far is Daniel's head from the surface of the water, namely the surface itself is when the height is nill, so his head is at the surface and the height of it is just 0, thus h(t)  = 0.  Namely, what is "t" when h(t) is 0?

clearly the seconds cannot be a negative unit, so is not -3/2.
 
        
        
        
Well do 24 - 13.
You should get 11.
N = 11.
        
                    
             
        
        
        
Answer: 37
Explanation: Triangles's angles add up to 180. 180-45-98 is 37