HELP PLEASE I HAVE NO IDEA WHAT IM DOING BUT I DONT WANT TO FAIL SOMEONE EXPLAIN PLZ

Aproduction manager test 10 toothbrushes and finds that their mean lifetime is 450 hours. she then design sales package of this type of toothbrush. it states that the customers can expect the toothbrush to last approximately 460 hours. this is an example of what phase of inferential statistics

Which of the following represents the length of a diagonal of this trapezoid?

Louis wants to give \$15 to kids who need school supplies. he also wants to buy a pair of shoes for \$39. how much money will he have to save for both?