Which is equivalent to(6 - i)-(3 –8i)?

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

Write the point-slope form of the line passing through (2, -12) and parallel to y=3x.

Y= a(x-3)squared-1 what is the value of a