Professor Brown performed the same kind of experiment as described in Problem 83, except t...

Professor Brown performed the same kind of experiment as described in Problem 83, except that he replaced the food in the goal box with a mild electric shock. With the same kind of apparatus, he was able to measure the avoidance strength relative to the distance from the object to be avoided. He found that the avoidance strength a(measured in grams) was related to the distance d that the rat was from the shock (measured in centimeters) approximately by the equation

If the same rat were trained as described in this problem and in Problem 83, at what distance (to one decimal place) from the goal box would the approach and avoidance strengths be the same? (What do you think the rat would do at this point?)