Chris explains how to find the numeric data in a word problem with the equation D = r x t. The problem gives the values of D (100 miles) and r (20 mph). Chris then explains how to isolate variable t and find its value.
Letters can be used to stand in for unknown quantities.
Trial and Error – substitute a possible answer for a variable.
Carter and Chris try to get information from the only person who did not disappear in 1966, the principal. Pythagelo says he has the principal’s phone number but he gives Chris and Carter only two of the digits. They must solve several algebraic equations to learn the missing numbers.