## This question concerns computing subtraction using a production system.

This question concerns computing subtraction using a production system. Assume that WM initially contains information to deal with individual digits in the following form: (digitMinus top: n bot: m ans: k borrow: b), where n and m are any digits, and if n ≥ m, then k is n − m and b is 0, else k is 10 + n − m and b is 1. For example, (digitMinus top: 7 bot: 3 ans: 4 borrow: 0) would be in WM, as would (digitMinus top: 3 bot: 7 ans: 6 borrow: 1). The working memory also specifies the first and second arguments of a subtraction problem (the subtrahend and minuend): (topNum pos: i digit: d left: j) and (botNum pos: i digit: d left: j), where d is a digit, and i and j are indices indicating the current position of the digit and its neighbor to the left, respectively

### As an intern with the local home builder’s association, you have been asked to analyze the state of the local housing market, which has suffered during a recent economic crisis.

As an intern with the local home builder’s association, you have been asked to analyze the state of the local housing market, which has suffered during a recent economic crisis…..

### This question describes a simplified model of a device used to de-spin a satellite.

This question describes a simplified model of a device used to de-spin a satellite. A uniform circular disc of mass 12m and radius a lies on a smooth horizontal table….

### In a diatomic molecule, one atom is very much heavier than the other and the lighter atom is free to move on a straight line through the centre of the heavier atom.

In a diatomic molecule, one atom is very much heavier than the other and the lighter atom is free to move on a straight line through the centre of the….