Multiply the amount of inches it is by 30 and you will know what the size is in feet.
        
                    
             
        
        
        
Answer:
100 ≥ 12x + 28
Step-by-step explanation:
He needs $100 for the new bike but already has the $28 so you also have to add 12x because thats what you need to find. X represents the amount of days he has to work. 
 
        
             
        
        
        
Answer:
3/5
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
9r
Step-by-step explanation:
1.5r - 3r + 10.5r
10.5r + 1.5r = 12r
12r - 3r = 9r
Final Answer = 9r
 
        
             
        
        
        
The Prove that two non-zero vectors are collinear if and only if one vector is a scalar multiple of the other is given below.
<h3>What are the proves?</h3>
1.  To know  collinear vectors:
∧ ⁻a ║ ⁻a
If  ⁻b = ∧ ⁻a
then |⁻b| = |∧ ⁻a|
So one can say that  line ⁻b and ⁻a are  collinear.
2.  If ⁻a and ⁻b  are collinear
Assuming |b| length  is  'μ' times of |⁻a | 
Then | 'μ' ⁻a| = | 'μ' ⁻a|
So  ⁻b = 'μ' ⁻a
Learn more about vectors  from
brainly.com/question/25705666
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