Nancy wants to find out how the steepness of a hill's slope affects the amount of soil that erodes from it. she has soil, a long pan, and a pile of books with which to build a model hillside. she has a watering can to model rainfall. in her experiment, which of the following factors should nancy make sure that she does not change?

Dumbledore decides to gives a surprise demonstration. he starts with a hydrate of na2co3 which has a mass of 4.31 g before heating. after he heats it he finds the mass of the anhydrous compound is found to be 3.22 g. he asks everyone in class to determine the integer x in the hydrate: na2co3·xh2o; you should do this also. round your answer to the nearest integ