A race car driver practices over four sessions. His finish times for specified distances are given. He wants to compare how fast he was driving in each session.

Place the finish times of each session in order from fastest to slowest according to the unit rate in kilometers per second.

8 kilometers
in 83 seconds
10 kilometers
in 97 seconds

18 kilometers
in 198 seconds
15 kilometers
in 168 seconds
, , ,

With these: 18/36 = 1/? missing number change 1 5/8 to improper fraction. change 19/5 to a mixed number.

Asmall (but heavy) particle placed in a glass of water will follow a zigzag motion because the particle will bounce off of the water molecules it meets. this is called brownian motion. a physicist simulates this on a computer, by varying the distance a particle can travel (called the mean free length), on average, before it collides with a water molecule and assigning the change in motion to be one of 8 directions, each with a similar probability. by running the simulated particle (with the same mean free length) many times she determines that it should take 15 seconds, on average, for the particle to fall to the bottom, with a standard deviation of 1.5 seconds. next she lets a real particle fall through a glass of water and finds that it took 18 seconds. what does she conclude, and why?

Which of the following statement about pascal's triangle are true?