Identify the range of values for Y

Name the quadrilaterals that have four equal sides.

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

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