Prompt Please answer question #1 in the *AP 2008 exam and question #2 in the AP* 2011 exam.
http://secure-media. collegeboard. org/apc/ap08_env_sci frq. pdf
http://secure-media. collegeboard. org/apc/ap11_frg environmental science pdf

Successful implementation of a new system is based on three independent modules. module 1 works properly with probability 0.96. for modules 2 and 3, these probabilities equal 0.95 and 0.90. compute the probability that at least one of these three modules fails to work properly.

Expresa commuter train leaves downtown sation and travels at a average speed of 55 miles per hour towards the north side sation, which is 50miles away. thirty minutes later, express commuter train #7 leaves north side and travels at a average speed of 35miles per hour towards downtown sation. at the moment the two trains pass each other, how far(in miles) is train #12 from the downtown sation and how long(in minutes) has the #12 train been traveling

You give a $4 tip for a meal that cost $22. approximately what percent of the bill was your tip?