Please help with this nth term question

What is 1/2 x (6 x 4)+3 + 2 show your work

Adriveway is 40 yards long about how many meters long is it

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