85.
A solution to a problem is a path from the initial state to a goal state. Solution quality is measured by the path cost function, and an optimal solution has the highest path cost among all solutions.

87.
What is the name of the function in the following statement "A perceptron adds up all the weighted inputs it receives, and if it exceeds a certain value, it outputs a 1, otherwise it just outputs a 0"?

89.
Incorrect information results in unsatisfied preconditions for actions and plans _____________ detects violations of the preconditions for successful completion of the plan.