The first thing you should know for this case is that density is defined as the quotient between mass and volume:
 D = M / V
 In addition, you should keep in mind the following conversion:
 1Kg = 1000g
 Substituting the values we have:
 D = (23.0 * 1000) / (2920) = 7.88 g / cm ^ 3
 answer
 the density of the iron plate is 7.88 g / cm ^ 3
        
             
        
        
        
Answer: 4
The mechanical advantage is the ratio of the force exerted  by the object to the force applied to do work on it. 
Here, Jeff tried to lift a rock weighing 600 pounds by wedging board under the rock. Jeff who weighs 150 pounds uses all his weight to exert force on lever and lift rock. 
Mechanical advantage, 
Therefore, the mechanical advantage that lever provided to Jeff in lifting rock is 4. 
 
        
                    
             
        
        
        
I am a girl and i have a virgina and im 13 tho so dont touch me lolz mark brainly