Would someone be able to show me step by step how i’d be able to solve this i know the formulas but the wording just doesn’t make sense to me

Which ordered pair is a solution to the system of linear equations? 2x + 3y= 6 –3x + 5y = 10

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

Which expression is rational? 6. , square root two, square root 14, square root 49