Answer:
Step-by-step explanation:
-3i  √(-40) = -3i √40i²    ...(i² = - 1)
                  = -3i √40 i
               -3i  √(-40)  =   3√40
 
        
             
        
        
        
Answer:
The percentage that the coat was reduced is 25%.
Step-by-step explanation:
A percentage is always out of a factor of 100.
40 x 2.5 = 100
30 x 2.5 = 75
75/100 = 3/4
1/4 is missing, which is the percentage. 
1/4 = 0.25, or 25%
Hope This Helps!
 
        
                    
             
        
        
        
Answer:
$12.68
Step-by-step explanation:
Multiply the price of one pound by the amount of pounds you're buying,
8.45 x 1.5
= 12.675
Round up
= 12.68
 
        
             
        
        
        
Answer:
If we are to treat these as two ordered pairs, then the rate of change is 1.25.
Step-by-step explanation:
To find this, use the slope equation with the ordered pairs. 
m(slope) = (y2 - y1)/(x2 - x1)
m = (11 9/16 - 9 1/16)/(12 - 10)
m = (2 8/16)/2
m = 2.5/2
m = 1.25
Now we know that this could be a function since we have a constant slope. 
 
        
             
        
        
        
Answer:
4y = -3x - 48
Step-by-step explanation:
y - y1 = m(x - x1)
y1 = -9 x1= -4 m = -3/4
y -(-9) = -3/4(x -(-4)
y + 9 = -3/4(x + 4)
y + 9 = -3/4x -12/4
multiply through by 4
4y + 36 = -3x -12
4y = -3x -12-36
4y = -3x -48 in the form y = mx + c