Answer:
A(r)=15-3r
Step-by-step explanation:
switch the sign of +3r to make it -3r
 
        
             
        
        
        
Answer:
the answer is D
Step-by-step explanation:
 
        
             
        
        
        
8%=0.08
42÷0.08=525
So your answer is 525
        
                    
             
        
        
        
Answer:
A. Trinomial
Step-by-step explanation:
It says it's a polynomial and that based on the number of terms. So right then you can cancel out cubic and quadratic because they aren't polynomials. Also:
Cubic is just a variable with the exponent of 3. Examples:

Binomial is a polynomial with 2 terms. Examples:

A quadratic has a division sign.
 
        
             
        
        
        
Directrix: x=7
Focus:(-7,0)
Vertex:(0,0)