How do I find the value of x in an equilateral triangle

Given right triangle xyz, which correctly describes the locations of the sides in relation to

What are the equivalent ratios for 24/2= /3= /5.5=108/ = /15

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