Let wind speed = x mph 
when she rode 2 miles against the wind we have:-
speed = distance / time so
20 - x  = 2 / t -------(1)      where t is the time she took.
when riding with the wind we have 
20 + x = 3 / t--------(2)   adding equations (1) and (2):-
40  =  2/t + 3/t
40 =  5/t
t = 5/40 = 1/8 hr 
x = 20 - 2 / 1/8  = 20 - 16 = 4
Wind speed was 4 mph Answer
        
                    
             
        
        
        
Answer:
We can eliminate the second and third options because marking something up doesn't result in a number less than the original. Since we are told to select 3 options and there are 3 answer choices left we select the first, fourth, and fifth statements.
 
        
             
        
        
        
Answer:

From this, you can tell it's in slope-intercept form, has a slope of -1/2, and a y-intercept of -4.
I've included a picture of what this equation looks like.
 
        
                    
             
        
        
        
So first we start with division:
$750 divided by 2 equals $375.
Since one employee gets more than the other, we need to add more onto his/her salary.
So, next is addition.
$375 plus $200 equals $575.
So, one employee makes $375 while the other has an increase in his salary, so they get paid $575. 
Hope I helped you!