Staci has seven more cats then taylor. write an expression that illustrates how many cats staci has use x to represent the number of cats that taylor has

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 x is 6, then 7x= a. 13 b. 42 c. 42x d. 76

2.5 milligrams is equivalent to how many grams