Answer:
A
Step-by-step explanation:
Solution is in this picture.
 
        
             
        
        
        
Answer:
the vertex is (1,-1)
Step-by-step explanation:
 y = −3x^2 + 6x − 4
the vertex is at 
h= -b/2a  where ax^2 +bx+c
h= -6/2(-3)
h= -6/-6
h=1
substitute this in to find the y value
y = -3(1)^2 +6(1)-4
y = -3+6-4
y = -1
the vertex is (1,-1)
 
        
             
        
        
        
Answer:
b=5.3 units
Step-by-step explanation:
area = 24 sq. ft
24 = 1/2 (bh)
h = 9
1/2(9)=4.5
24=4.5b
24/4.5 = 5.3