Determine model represents exponential growth or exponential decay. then identify the initial amount and the percent increase or decrease

Step-by-step explanation:

Think of each of these in terms of the standard form of the exponential equation:

where a is the initial amount and b is the percent increase or decrease.  First off, the exponent is on the b, the increase or decrease.  It is not on the a value.  Second, if b is a decimal less than 1 or is a fraction less than 1, it is a decrease.  To find the percent increase or decrease, move the decimal 2 places to the right.  

Original problem                rewrite                     Initial amount     %inc/dec

                         1                 120% inc

                         1                 78% dec

            1                 62.5% dec

                 N/A                           28               103% inc

              N/A                  25,000             95% dec

                                  1                200% inc

Hopefully that helps!