D500A A combination lock consists of 5 digits. If you know the first digit, and the last 4 digits cannot be a 7. What is the maximum number of combinations to try to learn the combination for the lock?
E100 What is the equation for exponential growth? Describe each variable.
E100A Y=C(1+r) t Initial amount Growth factor Time period
E200 In y=10(.85) t What is the percent decrease every time period?