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Answer:
y = -3e^x
Step-by-step explanation:
If the horizontal asymptote is y=0 and the range is negative, then the parent exponential function is reflected across the x-axis. It will have a coefficient of -3 in order to make the y-intercept be -3. The base of the exponent can be any positive number not equal to 1. One possibility is ...
y = -3e^x
