One of the points that defines a certain quadrilateral is (1,1)(1,1)left parenthesis, 1, comma, 1, right parenthesis. The quadrilateral has rotational symmetry of 90^\circ90 ∘ 90, degrees about the point (-4,-4)(−4,−4)left parenthesis, minus, 4, comma, minus, 4, right parenthesis.

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?

The perimeter of a movie screen is 54 meters. the screen is 18 meters wide. how tall is it?

25 ! the line of best fit is h = 5a + 86. predict the height at age 16. show your work.