Answer:
A: (m + p, n + r)
Step-by-step explanation:

 
        
             
        
        
        
First set up your two equations:
x + y = 90
x = 2y - 30
Then substitute what x equals in the second equation into the first equation:
(2y -30) + y = 90
Now solve for y:
3y -30 = 90
3y = 120
y = 40
Then use y = 40 and substitute the value for y into one of your original equations and solve for x.  I'll choose the first one, but either one will work.
x+ 40 = 90
x = 50
So your solution is x = 50 and y = 40
        
             
        
        
        
Answer:
2.62
Step-by-step explanation:

First, write the square root as exponent.

Move the denominator to the numerator and negate the exponent.

Use log product property.

Use log exponent property.

Substitute values.

 
        
                    
             
        
        
        
The answer is 2. I hope this helped.
        
             
        
        
        
Answer:
14/33
Step-by-step explanation: