Question 1155241
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You say "I get 1/2".<br>
What does that mean?  The question asks for an exponential function; "1/2" is not a function.<br>
What you found (apparently) was the a in the general form y=ba^x.<br>
The a is 1/2; since the y-intercept (when x=0) is 8, the b in your function is 8.<br>
The answer -- the exponential function -- is y=8(1/2)^x,<br>