Hans is working on a design for a table, with a surface that is in the shape of a triangle. He used a coordinate gird to draw the triangular shape with vertices at coordinates (-2,-6), (5,
-4), and (0,3). The length of each unit on the grid equals 10 inches. Hans plans on putting a
metal rim around the edge of the table, so he needs to find the triangle's perimeter.
What is the approximate perimeter of the triangle?

Inez has a phone card. the graph shows the number of minutes that remain on her phone card a certain number of days.

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

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).