90-7x3
90-21=69 
Ther you go have a great day
        
                    
             
        
        
        
Chris and Jim must replace a <em>total</em> quantity of 17 tyres.
<h3>What is the minimum number of tyres to be replaced?</h3>
In this problem we must use an inequality of the form f(x) ≥ a, where f(x) is the difference between the number of tyres replaced by Jim and the number of tyres replaced by Chris:
(25/20) · x - x ≥ 3
(5/20) · x ≥ 3
x ≥ 12
Then, the <em>minimum</em> number of tyres to be replaced is n = 15 + 12 = 17 tyres.  
To learn more on inequalities: brainly.com/question/20383699
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Answer:
i think is the last one
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
under the seaquance 
Step-by-step explanation:
mark me brilliant 
 
        
             
        
        
        
First find the area of the large rectangle which is 90 by you times 3 and 3 which is 9 then you times 5 and 2 which is 10 after that u times 9 and 10 which is 90 So to make the small rectangle times 6 and 15 because 3 times 2 equals 6 and 5 times 3 equals 10 so that means the area of one small rectangle is 6 and the other rectangle us 15 then u multiple