Twice the difference of a number and 6 is greater than -28 .

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

If g^-1(x) is the inverse of g (x) which statement must be true

If a is a nonzero real number then the reciprocal of a is