Consistent and independent
        
             
        
        
        
Answer:
40%
Step-by-step explanation:
(21-15)/15=0.4
0.4×100=40
 
        
             
        
        
        
Answer:
i. No, Maurice statement is wrong.
ii. Stephan does not have sufficient pieces of wood to make the tray because the square inches required is more than what he has.
Step-by-step explanation:
Stephan's piece of wood measures; 18 inches in length and 12 inches in width. 
Since the piece of wood has a shape of a rectangle,
the area of the piece of wood = length × width
                                                  = 18 × 12
                                                 = 216 square inches
According to Maurice's statement, he could make a tray that has a base of 1012 inches by 1012 inches. 
The base has the shape of a square, so that;
      the area of the base = length × width = 
                                        = 1012 ×1012
                                       = 1024144 squared inches
This shows that Stephan does not have sufficient wood to make the tray because the square inches required is more than what he has.
 
        
             
        
        
        
The object should be placed 20/cm from the lens so as to form its real image on the screen
<h3>Mirror equation</h3>
The mirror equation is given according to the expression below;
1/f = 1/u + 1/v
where
f is the focal length
u is the object distance
v is the image distance
Given the following parameters
f = 5cm
v = 20cm
Required
object distance u
Substitute
1/5 = 1/u +1/20
1/u = 1/5-1/20
1/u = 3/20
u = 20/3 cm
Hence the object should be placed 20/cm from the lens so as to form its real image on the screen
Learn more on mirror equation here; brainly.com/question/27924393
#SPJ1
 
        
             
        
        
        
John spent 30 on six cars 5 times 6 = 30