Answer: 6x+9c+4
Step-by-step explanation:  (8 + 6x) + (-4 + 9c)
                                               8+6x-4+9c
                                               6x+9c+8-4
                                               6x+9c+4
 
        
             
        
        
        
They get 2/3 because 2 divided by 3=2/3.
        
             
        
        
        
Answer:
32pi
Radius=1/2 Diameter
radius=2
Area of circle= pi*radius^2= 4pi
4pi*8=32 pi
 
        
                    
             
        
        
        
Answer:
initial velocity = 64 m/s
Step-by-step explanation:
Differentiate H = 64t - 16t² to find an equation for velocity:
Velocity =  = 64 - 32t
 = 64 - 32t
Initial velocity (u) is when t = 0:
    u = 64 - 32(0) 
⇒ u = 64 - 0 
⇒ u = 64 m/s