Which of the following scenarios could be represented by the expression 10x+5y?
a) the number of kids in a school class if there are 10 girls and 5 boys.
b)the total number of marbles in a jar if there are 5 green and 10 red.
c) the total weight of a box containing x 5-ounces packages of almonds and y 10-ounce package of peanuts.
d)the cost for x adults and y children to go to the movies if adult tickets are $10 and child tickets are $5.

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?

Suppose you have 10 skittles. 5 green and 5 red. you choose 4 without looking. what is the probability that all 4 skittles will be green?

Write the point slope form of the equation of the line passing through the points (-5, 6) and (0.1).