How large a sample size would be needed to estimate the percentage of wireless routers in San Francisco that use data encryption, with an error of ± 2 percent and 95 percent confidence? (Enter your answer as a whole number (no decimals).)

answer: the proof is mentioned below.

step-by-step explanation:

since, given:   lines bc = ef

prove:   lines ac > ef

          statements                                           reason

1. bc=ef                                           1. given

2. ac= ab+bc                                 2. because b is the point between the  

                                                            line segment ac

3.   ac > bc                                       3. because if a line segment is equal to

                                                          the sum of two line segments then it is

                                                          always greater then each of these

                                                          individual line segments

4. ac > ef                                         4. by equality property.

one triangle is 2.5 times bigger than the other triangle.