The first thing we must do for this case is to define variables.
 We have then:
 x: number of slices
 y: total cost
 We write the linear function that relates the variables.
 We have then:
 
 Then, we evaluate the number of slices to find the total cost.
 -two slices cost:
 We substitute x = 2 in the given equation:
 
 Answer:
 two slices = 2.2 $
 -ten slices cost:
 We substitute x = 10 in the given equation:
 
 Answer:
 ten slices = 11 $
 -half a slice cost:
 We substitute x = 1/2 in the given equation:
 
 Answer:
 half a slice = 0.55 $
 
        
             
        
        
        
Answer:
Option B, 22
Step-by-step explanation:
Alternate interior angles are same
 
        
                    
             
        
        
        
She has 648 shirts. 
Work:
Lisa has 42 pineapples. 4 + 2 = 6
Johnny has 6 marbles. 
42 + 4 + 2 + 6 = 54
54 + 5 + 4 = 63
63 + 6 + 3 = 72
But 72 is a multiple of 6!
Let's go further:
72 * 6 = 432
Now let's look at the word 'shirt'. 
The middle letter is I. 
I is the 9th letter of the alphabet. 
Remember the number 72?
72*9 = 648
        
             
        
        
        
In order to subtract fractions, we must find a common denominator, then subtract the numerators.
The common denominator (LCM(3, 5)) is 15.
We must multiply the first numerator by 5, because 3*5=15 and the second numerator by 3 because 5*3=15.
We get  .
.
All we need to do now is subtract the numerators:  .
.
The answer is 14/15.
 
        
                    
             
        
        
        
Most graphing calculators will do weighted averages pretty easily. It is mostly a matter of data entry.
mx = -2
my = 10
(x, y) = (mx, my)/10 = (-0.2, 1)