Answer:  25x² - 64
<u>Step-by-step explanation:</u>
   (5x + 8)(5x - 8)
=        5x(5x - 8)   +    8(5x - 8)
=      25x² - 40x    +    40x - 64
=      25x²         + 0x           - 64
=              
NOTE: descending powers means the biggest exponent goes first, then the next biggest exponent, etc.
For example: x⁴ then x³ then x² then x then the number (which is actually x⁰)
 
        
             
        
        
        
Answer:
250 is the answers for the question
Step-by-step explanation:
please give me brainlest
 
        
                    
             
        
        
        
The correct answer is C. i think
        
                    
             
        
        
        
Answer:
21 windows
Step-by-step explanation:
colleen's family plans to paint the windows of their house. her father will paint twice as many windows as her mother, and Colleen and her 2 brothers will paint an equal number of the rest of the windows. Colleen decided to do her own share and her mother's share and paints 7 window, which is one less than her father's share. how many windows are in their house?
Answer: Let the number of window Colleen father would paint be x while that of her mother be y. Since her father will paint twice as many window as her mother, therefore the number of windows painted by the father x = 2y
Let the number of windows each painted by Colleen and her 2 brothers be z since they would paint the same number of windows. The total number of windows to be painted = 2y + y + z + z + z = 3y + 3z = 3(y + z).
Then number of windows needed to be painted by Colleen and her mother is given as z + y. Since Colleen painted 7 windows as her share and her mother share i.e. y + z = 7
Therefore the total number of windows = 3(y + z) = 3(7) = 21 windows