Answer all these for a ton of points

The last time i bought this product , it cost $20.00 but it looks like it cost 29. 60 today? what is the increase

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

Find the solution(s) to x^2-14+49=0