The question gives the relationship to be 

We will interpolate to solve the question.
First Question: 147 mi

Cross multiplying,
 
 
        
             
        
        
        
Plant grows at 3CM per day
equation: y= 3x
21 is y so 21= 3x. divide by 3 so it's been 7 days
 
        
             
        
        
        
1/5( 5/2 x 4/7 -11/7) + 3/28 
Multiply the terms (5/2 x 4/7) in bracket then subtract it from 11/14. Result will be 10/7.
Then multiply 1/5 with 10/7. The result will be 2/7.
2/7 + 3/28 = 11/28
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Answer:
Step-by-step explanation:
add 12 and a number: 12 + c
subtract a number from 12: 12 - c
divide a number by 12: c : 12 or c/12
multiply 12 by a number: 12 · c = 12c
 
        
             
        
        
        
The area of a trapezoid is half its height multiplied by the sum of its two bases. So in other words 1/2h(b1+b2)