the area of a square is given by x2, where x is the length on one side. Mary's original garden was in the shape of a square. she has decided to double the size of her garden. write an expression that represents the area of mars new garden. evaluate the expression if the side length of mary's original garden was 8 feet

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?

Solve the system of equations. y= 2x y= x^2 - 15

What are “like terms”? why can we only add like terms?