What is the process that you can do over and over, where each result does not affect the next. (ex. flipping a coin, rolling dice, choosing a card, etc.)

For one history test, keith had to answer 40 questions. of these 40 questions, keith answered 28 of them correctly. what percent did keith get on his history test? round your answer to the nearest tenth if necessary

Hannah paid $3.20 for 16 ounces of potato chips. hank paid $3.23 for 17 ounces of potato chips. who paid less per ounces?

Given sin28.4=.4756, cos28.4=.8796, and tan28.4=.5407 find the cos of 61.6