The answer is (it can be curved) because it's doesn't have to cross the origin and it's a U shape so it can't look like a straight line and it doesn't have a constant rate of change. :)
        
             
        
        
        
Answer:
23
Step-by-step explanation:
With f(4), we plug 4 into the function. 
f(4) = 4² + 7
f(4) = 16 + 7 
f(4) = 23
 
        
             
        
        
        
Answer:
20
Step-by-step explanation:
You use the distributive property. 
Distribute the 2 to whatever is inside the parentheses. (You will multiply)
4×2=8
2×6=12
Substitute the answers above into the parentheses.
(8+12)=20
 
        
             
        
        
        
Answer:
3
Step-by-step explanation:
f(3) = 3(3)-4
f(3)= 9-4
f(3) = 5
g(2) = (2)
g(2) = 2
f(3)-g(2) = ?
(5) - (2) = ?
(5) - (2) = 3