I must assume that you meant the following:
 10(Q-3R)
P = ----------------
 R
Multiplying both sides by R, we get PR = 10R(Q-3R), or PR = 10RQ - 30R^2.
Rearranging these terms so that powers of R are in descending order:
30R^2 - 10RQ + PR = 0
Factoring out R, we get
R(30R - 10Q + P) = 0. This has two solutions:
R = 0, and 10Q - P
30R = 10Q - P, so that R = --------------
 30
 
        
             
        
        
        
Sin 30 is equal to Cos 60, I hoped that helped u
        
             
        
        
        
Answer:
A) Sheri has the faster commute by 6.2 miles/hr.
Step-by-step explanation:
Given 
John's commute to work  
 
Sheri's commute to work   
 

John's commute to work in miles per hour = 
Sheri's commute to work in miles per hour =
We can see that Sheri has a faster commute. 
Difference between the rates = 
 
∴ Sheri has the faster commute by 6.2 miles/hr.
 
        
             
        
        
        
Answer:
3/5
Step-by-step explanation:
1/10+1/20=3/5