Which of the following is the graph of a linear function?
1. a coordinate grid is shown with a slanting straight line segment that starts at a point in the first quadrant, cuts the x-axis and y-axis and ends at the third quadrant.
2. a coordinate grid is shown with an inverted u-shaped graph that cuts the axis at 2 points and the positive y-axis at 1 point.
3. a coordinate grid is shown with two slanting straight line segments that meet at a point on positive y-axis.
4. a coordinate grid is shown with two slanting straight line segments that meet at a point in the second quadrant.

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 is the area of a pizza with a radius of 40 cm leave the answer in terms of π to find your exact answer 40π cm² 1600π cm² 800π cm² 80π cm² π=pi

Solve 2x+y=3 x+y=5 in substitution method