Four car dealers are comparing new car sales. The first dealer sold 18 of the 100 cars on his lot. The second dealer sold 32 of the 100 cars on his lot. The third dealer sold 15 of the 50 cars on his lot, and the fourth dealer sold 21 of the 50 cars on his lot. What’s the largest fraction of cars sold on the four lots ?

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?

Two corresponding sides of two similar triangles are 3cm and 5cm. the area of the first triangle is 12cm^2. what is the area of the second triangle?

Using only odd number for numerators write two different subtraction problems that have a difference of 3/4