Astate university issues five-digit student identification numbers to all of its students. none of the identification numbers contain the digit 0 and the digits cannot be repeated. how many ways are there to arrange five digits if only the numerals 1 through 9 are used?

What is the measure of x, in degrees

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

Lines a and b are parallel. what is the value of x? -5 -10 -35 -55