-2.5 because a positives opposite is a negative.
Here's a rough graph haha
the graph has a factor of 4/1 (considered the "slope"), and the vertex is translated 2 units to the right (whatever is in the | lines | has the negative/positive flipped), and 6 units down.
Radius is 5 cm. is the answer
Exponential function because log deals with finding the exponent so the inverse is an exponential function