Answer:
x=3.5
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
c
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
 C . 4
Step-by-step explanation:
step 1 : -3 multiply with inside of the ( 7x-5 ) 
= -21x + 15 
step 2 : then it will be 21x + 15 = 87 + 3x 
step 3 : switch between the odds into like this 
 21x - 3x = 87 - 15 
 
step 4 : subtract it all 
 18x = 72 
step 5 : bring 18 to the other side 
 x = 72/18 
step 6 : to find the ans of x is just calculate them 
 x = 72 ÷ 18 
 = 4 
Or you can do like these ⬇️ 
 
-3 ( 7x - 15 ) = 87 + 3x 
 21x + 15 = 87 + 3x 
 21x - 3x = 87 - 15 
 18x = 72 
 x = 72/18 or 72÷18 
 x = 4 
 
        
             
        
        
        
Answer:
<em>Worker B needs 9 days to finish the rest of the work</em>
Step-by-step explanation:
<u>Proportions</u>
Worker A finishes a project on his own in 12 days and worker B does the same in 16 days.
Worker A does 1/12 of the project in one day and worker B does 1/16 of the project in one day. When working together, they do

After 3 days they have completed:

parts of the project, this means it still remains:

parts of the project and it is done by B alone. Since B does  per day, he now takes
 per day, he now takes

days to complete the project.
Worker B needs 9 days to finish the rest of the work
 
        
             
        
        
        
Answer:
40
Step-by-step explanation:
step 1:    (-4)^2=16
step2:    12X2=24
step3:     16+24+40
Ps: when you do a  math that involves both addition and multiplication, 
we should do multiplication and then addition