Please help it would mean a lot thanks ! :) How does this graph change between (2.5, 2) and (4.5, 0.25)?

increases
decreases
or
no change

In a school 2/3 of the students study a language of those who study a language 2/5 study french

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

These tables represent a quadratic function with a vertex at (0, -1). what is the average rate of change for the interval from x = 9 to x = 10?