5.07, the 4 is the thousands
        
                    
             
        
        
        
Y=4x. y=mx+b m=slope b=y intercept m=4 because it goes up 4 over 1 and 4/1=4 b=0 because it started at 0, making the equation y=4x+0 or just y=4x
        
                    
             
        
        
        
Answer:
a. Let the variable be  for the fundraising activities and
 for the fundraising activities and  as the revenue for foundation.
 as the revenue for foundation.
b. 
c. $43.2
d. $1416.67
Step-by-step explanation:
Given that: 
The World Issues club donates 60% of the total of their fundraising activities.
Answer a. 
Let us choose the variable  to represent the money earned during fundraising activities and
 to represent the money earned during fundraising activities and  for the revenue generated for foundation.
 for the revenue generated for foundation.
Answer b.
Foundation will receive 60% of the total of the fundraising activities.
Equation to determine the money that will be received by foundation:

Answer c.
Given that x = $72, M = ?
Putting the value of x in the equation above:

Answer d.
Given that M = $850, x = ?
Putting the value of M in the equation above to find x:

So, the answers are:
a. Let the variable be  for the fundraising activities and
 for the fundraising activities and  as the revenue for foundation.
 as the revenue for foundation.
b. 
c. $43.2
d. $1416.67