3,190,000 is  319 x 10^5 in scientific notation
        
                    
             
        
        
        
Bob need to paint 205 square feet.
Solution:
Length of the door = 7 ft
Breadth of the door = 5 ft
Area of the door = length × breadth
                             = 7 × 5
                             = 35
Area of the door = 35 ft²
The given image is a trapezoid.
Top base = 12 ft
Bottom base = 20 ft
Area of the trapezoid = 
                                     
                                     
                                     = 240
Area of the trapezoid =  240 ft²
Surface area to paint = Area of the trapezoid – Area of the door
                                     = 240 ft² – 35 ft²
                                     = 205 ft²
Hence Bob need to paint 205 square feet.
 
        
             
        
        
        
Answer:
The answer is four months
Step-by-step explanation:
You have a starting cost of $50 with a $20 fee every month
OR
You have a starting cost of $30 with a $25 fee every month
Start: $50 ($20 per month)
M1 = $70, M2 = $90, M3 = $110, M4 = $130
Start: $30 ($25 per month)
M1 = $55, M2 = $80, M3 = $105, M4 = $130
In conclusion, the prices of the two will match at Month 4