7x+9
5x+2x= 7x
5+4=9
7x + 9 is the result when combining like terms.
 
        
             
        
        
        
Answer:
9.73  cm to 2 DP
Step-by-step explanation:
Total of the  lengths involved = 7*9.4 +  5*10.2
= 116.8 cm
So the mean of the 12 fingers
= 116.8/12
= 9.73  cm to 2 DP.
 
        
                    
             
        
        
        
Step-by-step explanation:
7x + 3x + 90= 180
10x= 180-90
10x= 90
x= 90/10
x=10
 
        
                    
             
        
        
        
The equation would be 40+15p=70+5p. You would subtract 5p from each side (15-5) and (5-5) and you'll have 40+10p=70. You would then subtract 40 from each side (70-40) and (40-40) to have 10p=30. You would divide by both of the sides by 10, you would end up with p=3. P is price training. The reason you divide and subtract on both sides is because you want the months to be on one side and the price training on the other side.
        
             
        
        
        
To find the volume, multiply length, width, and height together
19 x 20.4 x 6 = 2325.6
2325.6 in³ is your answer
hope this helps