Shya works part-time at a gift-wrapping. the store sells wrapping paper rolls and package of wrapping rolls. there are a total of 125 rolls and package. each roll costs $3.50 and each package costs $2.25. the total of all of the rolls and package is $347.50 . how many rolls of wrapping paper are there?

Naomi’s parents want to have 50,000, saved for her college education, if they invest 20000 today and earn 7% interest compound annually, about how long will it take them to save 50 thousand

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?

Hi my sisters and brothers can tell me the answer because i don’t understand the question