Whats the answer to 876 + 17.2638

Is it true that product of 3 consecutive natural numbers is always divisible by 6? justifyyour answer

If f(x)= 3x+6 which of the following is the inverse of f(x)

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