Answer:
x = 7
Step-by-step explanation:
Start by solving for  which is a common expression for both equations. Then in the first equation:
 which is a common expression for both equations. Then in the first equation:

and in the second equation:

Now we make the two  expressions equal so we get:
 expressions equal so we get:

 
        
             
        
        
        
Answer:
5 + y ≥ 7
Step-by-step explanation:
"The sum of 5 and y" 
The sum of two items will be the two items added, and in this case, it is 5 and y, or
5 + y.
"Greater than or equal to 7"
Here, use the symbol, ≥, and 7.
≥ 7
Combine those to get the final equation:
5 + y ≥ 7.
 
        
                    
             
        
        
        
Answer:
<h3>
            -2a³ + 9a² + 6ab² + 45a + 18b² </h3>
Step-by-step explanation:
(a + 3)×(−2a² + 15a + 6b²) = 
= a×(−2a² + 15a + 6b²) + 3×(−2a² + 15a + 6b²) =
= -2a³ + <u>15a²</u> + 6ab² - <u>6a²</u> + 45a + 18b² = 
= -2a³ + 9a² + 6ab² + 45a + 18b²