You have $76 in a savings account and you deposit an equal amount into your account each week. After 6 weeks the account holds $208. Write an equation that represents the amount y (in dollars) of money in the account after x weeks.

The life, in years, of a certain type of electrical switch has an exponential distribution with an average life b = 2. if 100 of these switches are installed in dif- ferent systems, what is the probability that at most 30 fail during the first year?