Answer:
$1,954
Step-by-step explanation:
 
        
             
        
        
        
C=pid
d=45
c=45pi
aprox pi=3.14
c=141.3
A is answer
        
             
        
        
        
Answer:
19.32
Step-by-step explanation:
One way to find the missing number is to get the value of the left side of the equation first.
8.4(1.5 + 2.3) = 31.92
Now we need to take that value and subtract it to the value on the right side of the equation.
31.92 - 12.6 = 19.32
So we have:
8.4(1.5 + 2.3) = 12.6 + 19.32
31.92 = 31.92
 
        
                    
             
        
        
        
<span>gravitational potential energy : P
Gravity : g
Mass : m
height : h
P = mgh  = 3 x 9.8 x 0.45 = 13.23 Joule
Potential energy is work , from the known formula
W = Fd ( work = force x distance ) 
W = P ( in case of potential energy height change)
F is the force acting on the body in case of ideal ramp , the only force acting is the weight of the body
F = mg ( not just <m> as the force is mg (Newton) gravity effect)
d is the displacement in direction of force, as we have considered the force to be the weight not it's component in direction of the ramp , the change in displacement is the change in height so
d = h 
W = Fd = (F = mg) x (d = h) = mgh 
W = mgh = P
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