Did I get this right if I did not please correct me and explain please thank you!

Classify the following triangle check all that apply

The final cost of a sale is determined by multiplying the price on the tag by 75%. which best describes the function that represents the situation?

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