If two planes leave an airport at the same time with one flying west at 400 miles per hour and the other flying east at 260 miles per hour, how long will it take them to be 2640 miles apart ?

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?

An equation where variables are used to represent known values—function notation true or false

If y varies directly as x2 and y=6 when x=6, find the constant of variation.