Marble middle school paid $500 for 16 graphing calculator

$31.25 per graphing calculator

Step-by-step explanation:

The question isn't there so I'm going to guess that it is asking for what is the cost of one calculator

$500/16=

$31.25 per graphing calculator

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.

the answer is 15.50 for one mile

b) is slope: 0   y- intercept 15.5