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The equation that's illustrated simply depicts an investment as it shows the principal, and interest rate.
<h3>What is an investment?</h3>
It should be noted that an investment simply means a dedication of an asset in order to increase the value over a period of time. 
In this case, the equation that's illustrated simply depicts an investment as it shows the principal, and interest rate. To calculate the investment, the time, amount and rate will be considered.
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Y = 12x......y = 12(4).....y = 48.....so she pays $ 48 for the old brand when buying 4 boxes
y = 8x...y = 8(4)......y = 32...so she pays $ 32 for the brand she changed to, when buying 4 boxes
so the super saving brand would save her (48 - 32) = $ 16 per month
        
             
        
        
        
V=L X W X H
1,296=6 x w x 24
1,296=144 x w
1296/144=w
9=width