Answer:
15
Step-by-step explanation:
 
        
             
        
        
        
Answer:
First step=13x+7x=18+42
Step-by-step explanation:
13x-42=18-7x
First step
It is to collect like terms of the equation
13x+7x=18+42
20x=60
x=60/20
x=3
 
        
             
        
        
        
Answer:
see explanation
Step-by-step explanation:
The equation of a line in slope- intercept form is
y = mx + c ( m is the slope and c the y- intercept )
Rearrange x - 2y = - 3 into this form
Subtract x from both sides 
- 2y = - x - 3 ( divide all terms by - 2 )
y =  x +
 x +  ← in slope- intercept form
 ← in slope- intercept form
with m = 
• Parallel lines have equal slopes, thus
y =  x + c ← is the partial equation
 x + c ← is the partial equation
To find c substitute (- 1, 2) into the partial equation
2 = -  + c ⇒ c = 2 +
 + c ⇒ c = 2 +  =
 = 
y =  x +
 x +  ← in slope- intercept form
 ← in slope- intercept form
Multiply through by 2
2y = x + 5 ( subtract 2y from both sides )
0 = x - 2y + 5 ( subtract 5 from both sides )
- 5 = x - 2y, thus
x - 2y = - 5 ← in standard form
 
        
             
        
        
        
Answer:
Step-by-step explanation:
V=πr2h
3
r	Radius	
h	Height
 
        
             
        
        
        
3.9/3=$1.30
2.2/2=$1.10
The unit prices are $1.30 and $1.10.
Hope this help!