## On the Subject of Algebra

“Why do we need to study algebra? We'll never use it in real life...” Anybody else remember saying that?

- The module consists of a number pad and two screens.
- In three stages, the module displays an equation involving the variables
`a`,`b`and`c`, respectively. - Solve the equation for
`a`,`b`or`c`and enter the answer to progress to the next stage. - In each equation, the variables
`x`,`y`and`z`may appear. Calculate their values using the columns of the following table:

x = n |
y = i − p |
z = m + t × d |
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n = sum of digits in the serial number |
i = number of indicatorsp = number of ports |
m = number of modulest = number of AA batteriesd = number of D batteries |
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3 or more battery holders present? | +2 | 2 or fewer battery holders present? | −2 | No battery holders present? | +3 |

RJ-45 port present? | −1 | Serial port present? | +3 | Parallel port present? | −6 |

Lit BOB indicator present? | +4 | Unlit FRQ indicator present? | −5 | Lit MSA indicator present? | +2 |

Serial number contains a vowel? | −3 | Sum of the serial number digits is prime? | +4 | Sum of the serial number digits is divisible by 3? | +1 |