Answer:
what do you need?
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
The river is 3.15 feet deep.
Step-by-step explanation:
First let's recognize what we need to find: the depth of the river
We know last year the river was 4.2 feet deep, but it dropped 25%. This means we also need to find how much it dropped. To find this, we need to know what 25% of 4.2 is. Write an equation for this.
y = 25% of 4.2
y = 0.25 • 4.2
y = 1.05
This means that the river dropped 1.05 feet. To know its depth now, we need to subtract 1.05 from 4.2. Write an equation for this.
d = 4.2 - 1.05
d = 3.15
The river is 3.15 feet deep.
Hope this helps!
 
        
             
        
        
        
Ok so you could use the equation h=t divided by w. 
h represents the hours volunteered in one week. 
t represents the amount of hours volunteered in the original amount of weeks. 
w represents the original amount of weeks. 
When you plug In the numbers you get h=72 divided by 12 which gives you h=6 so Penn volunteered 6 hours in one week. 
You know the answer is reasonable because there are 168 hours in a week, so Penn could easily spend 6 hours a week volunteering. 
Sorry if my explanation is confusing, but I tried to help. Good luck :)
        
             
        
        
        
The answer is the first options: y=-2
hope this helps
        
                    
             
        
        
        
F(x) = 1/4x-1
i hope this helps!