Answer:
Only 16 problems correct
Step-by-step explanation:
Well I thought that since 80% is  4/5 then I should do 20 divided by 5 which will get me 4 and since I'm doing 4/5 I should go all the way up to 80% of 20 which will get me 16.
I'm not making that much sense but 
Hope this helps :)
 
        
             
        
        
        
Answer:
Step-by-step explanation:
 
        
             
        
        
        
Answer:2 hours 15 mins = 2 1/4 hours
2 1/4 hours = 25 miles
1 hour = 25 ÷ 2 1/4 = 25 ÷ 9/4 = 25 x 4/9 = 11.1 miles
Answer: 11.1 mph
Step-by-step explanation:
 
        
             
        
        
        
Answer:
Solving the given linear system, we get x = 1 and y = -3.
The solution set is: (1,-3)
Step-by-step explanation:
We need to solve the linear system of equations.

We can write second equation y=x-4  as: 
Let:

Now, Adding equation 1 and 2

So, we get x = 1
Now, put value of x in second equation to find value of y:

So, we get y = -3
Solving the given linear system, we get x = 1 and y = -3.
The solution set is: (1,-3)
 
        
             
        
        
        
Answer:
There are 327,811 doctors.
Step-by-step explanation:
Percentage of female doctors =  %
%
Number of female doctors = 
Percentage of Male doctors =  %
%
                                                = %
%
So if  doctors are represented by
 doctors are represented by  how many doctors are represented by
 how many doctors are represented by  %?
%? 
 % represents total number of doctors.
% represents total number of doctors. 
⇒
=327,810.65
Number of doctors has to be a whole number so we rounf off the number to nearest whole number:
Therefore there are 327,811 doctors.