What is the exact value of tan4pi/3?

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

The volume of a cube-shaped shipping container is 13,824 cubic inches. find the edge length of the shipping container.

Which word in the sentence below is an interrogative pronoun? who is picking us up from school? whousisfrom