The values of z and y vary together at a constant rate of change such that Ay = 0.5Ax. (This informalioH appliesS w all three parts.) a. Suppose the value of a varies from 2 = 1.5 to x = -3. Your classmate comes to you after calculating the change in z for this interval: Ar = 0.5(-3 – 1.5) = –2.25 Are they right? (Select the one best choice.) ONo. They calculated Ay instead. ONo. They used addition instead of subtraction. ONo. They subtracted in the wrong order. O Yes. This is the change in . b. Suppose the change in r between two points in this relationship is 5. Another classmate has calculated the corresponding change in y: Ay = 5 Are they right? (Select the one best choice.) O No. This is the change in r. ONo. The change in y should be the same sign as the change in z. ONo. They divided instead of multiplied. O Yes. This is the change in y.

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Exponential Growth Model

The relation that represents an exponential function is: