The following question has two parts. first, answer part a. then, answer part b.
part a
a high school athlete ran the 100 meter sprint in 13.245 seconds. round the time to the nearest tenth. enter the answer in the box.
seconds
part b
explain how you arrived at the answer. include any rules that you followed.

Suppose the radius of a circle is 16. what issuppose the radius of a circle is 16. what is its circumference its circumference

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?

What’s the domain of this function? fast