<h2>
Answer:</h2>
The cost in dollars is:
                        $ 1.8144
<h2>
Step-by-step explanation:</h2>
It is given that:
The 60-W lamp is operated  continuously for 1 week.
We know that:
   1 week=7 days
and 1 day=24 hours
This means that:
      1 week=24×7
i.e.  1 week= 168 hours
Also, 1 kW=1000 W
This means that:
  1 W=0.001 kW
Hence,
  60-W=0. 060 KW
i.e. Power= 0.60 KW
Hence, the energy consumed is: 
Energy=Power×Time
i.e.
Energy=0.060×168
i.e.
Energy=10.08 KWh
Also, cost of 1 KWh=18 cents
We know that:
1 cent=0.01 dollar
This means that:
 18 cents=0.18 dollar
i.e.
Cost of 1 KWh=$ 0.18
Hence, cost of 10.08 KWh is: $ (0.18×10.08)
i.e.
Cost of 10.08 KWh is: $ 1.8144
 
        
        
        
Answer:
The answer to your question is a)   y = 1.5x - 6     
                                                     b)   y = -4x + 6.1
                                                     c) Point (2.2, -2.7)
Step-by-step explanation:
First line                                                Second line
P (0, -6)           Q (1, -4.5)                        R (0, 6.1)       S (1, 2.1)
m = (-4.5 + 6) / (1 - 0)                              m = (2.1 - 6.1) / (1 - 0)
m = 1.5 / 1                                                m = -4/1
m = 1.5                                                    m = -4
Line                                                         Line
   y - y1 = m(x - x1)                                   y - 6.1 = -4(x - 0)
   y + 6 = 1.5(x)                                        y - 6.1 = -4x
   y = 1.5x - 6                                           y = -4x + 6.1
Solve the system by equality
                              1.5x - 6 = -4x + 6.1
                               1.5x + 4x = 6.1 + 6
                                     5.5x = 12.1
                                          x = 12.1 / 5.5
                                          x = 2.2
Find y
                              y = 1.5(2.2) - 6
                              y = 3.3 - 6
                              y = -2.7
Point (2.2, -2.7)
 
        
             
        
        
        
Just plot the dot between the lines for one
        
                    
             
        
        
        
The second is grater than first
42.6 × 10. YOU ARE OK