Find the perimeter. can someone explain to me how to find it?

Which inequality comparing two of the expressions is true when 0.7 < x < 0.9

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

Complete the solution of the equation. find the value of y when x equals to 28 x+3y=28