Which expression can be used to find the surface area of the following square pyramid? chose one anwer 4+3+3+3+3 4+ 6 +6 +6 +6 4 +3 +3+ 3 4+6

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