Answer:
Step-by-step explanation:
Suppose that at time  we have x mold cells. We are told that after 12 minutes the amount present is double. That is a
 we have x mold cells. We are told that after 12 minutes the amount present is double. That is a  we have 2x cells. Then, at
 we have 2x cells. Then, at  we have (2x)*2 = 4x. We can continue as follows
 we have (2x)*2 = 4x. We can continue as follows 
 we have (4x)*2 = 8x.
 we have (4x)*2 = 8x. 
 we have (8x)*2 = 16x
 we have (8x)*2 = 16x
 (one hour later) we have (16x)*2 = 32x.
 (one hour later) we have (16x)*2 = 32x. 
So after one hour from now we have 32x cells.
 
        
             
        
        
        
A pentagon only has one line of symmetry.
        
             
        
        
        
Answer:
x = 110°
Step-by-step explanation:
The sum of the interior angles of a polygon is
sum = 180° (n - 2) ← n is the number of sides
Here n = 6, thus
sum = 180° × 4 = 720°
Sum the given angles and equate to 720
125 + x + 130 + 90 + 165 + 100 = 720, that is
610 + x = 720 ( subtract 610 from both sides )
x = 110°
 
        
             
        
        
        
You can remove the  parentheses:-
 = 7q^3r^2 + 5qr^2 + 23q + −5qr^2 − qr^2 − 11q − 4q^3r^2  ( because there is + outside)
Bring like terms together
= 7q^3r^2 − 4q^3r^2  + 5qr^2  − 5qr^2 − qr^2 + 23q − 11q
= 3q^3r^2 - qr^2 + 12q   answer