Answer: 
Step-by-step explanation:
Using the same-side interior angles theorem,  .
.
Using the alternate interior angles theorem, 
 
        
             
        
        
        
2(x+7)+3(x+1)
= 2x+14+3x+3
= 5x+17
        
             
        
        
        
Answer:
See explanation
Step-by-step explanation:
1. Find the GCF of 40 and 44:

So,

2. Find the GCF of 13 and 52:

So,

3. Find the GCF of 15 and 81:

So,

4. Find the GCF of 64 and 28:

So,
