Answer:
b < = 65 <u><</u>
Step-by-step explanation:
 
        
             
        
        
        
Answer:
The temp got colder by -1
Step-by-step explanation:
The difference of -3 to -4
-4 + -3 = -1
 
        
             
        
        
        
FACTORISATION IS BASICALLY FINDING LIKE-TERMS.
1. FIND THE HCF OF 8. HERE, THE HCF IS 8. ALSO, CHECK ALL THE LIKE-TERMS. LIKE-TERMS ARE OUTSIDE THE BRACKET AND UNLIKE TERMS ARE INSIDE. 
2. ADD THE TERMS IN THE BRACKET AND THE TERMS OUTSIDE THE BRACKET FROM STEP 1.
8x + 8y + rx + ry
1. 8 (x + y) + r (x + y) 
2. (x +y) (8+r)
        
                    
             
        
        
        
This would be perpendicular