Lucy planted some corn in the back yard and measures its height regularly. The last time she checked, the stalks were 40 inches tall. Now they are 46 inches tall. What is the percent of increase in the height of the stalks?

answer: hey there,

the answer you are looking for is a..

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this is a direct variation proportion. y = kx

y is the total amount due, k is the constant of variation, and x is the number of texts sent.

plug in the 3.20 and the 16 to solve for the "k". this is the constant of proportionality. it is the value that will not change.

3.20 = k(16). solving you get $.20 per text.

the equation would then be y = .20x