From the ratio given you can determine that m is proportional to 1/(r^3). You can write this as m = k * 1/(r^3), k being your constant of proportionality. Then use this to calculate the next parts of the question.
        
             
        
        
        
Answer:
X=9
Step-by-step explanation:
3x-15=12
Add 15 to both sides which makes it
3x=27
Divide by 3, which gives you 9
 
        
             
        
        
        
The length of the toy tractor is 3.125ft
Data Given;
To solve this question, we need to find the length of the tractor using ratios.
<h3>What is Ratio</h3>
This is the proportion of a substance to the entire value of that substance.
If the length of the tractor is 25 ft, then the length of the toy tractor can be found when we divide 25 by 8.

The length of the toy tractor is 3.125ft.
Learn more on ratio here;
brainly.com/question/1781657
 
        
             
        
        
        
Answer:
D
Step-by-step explanation:
Joe already has $40 and can save $20 each week. the total amount he can save in a given number of weeks is $20 multiplied by the that number of weeks which in this case is w so 20w. To find the total T of the amount he has after w weeks, you add the amount he already has to the amount saved. So the equation would be T=40+20w