Will i be in trouble at the end of the school year if I don't have all my work done?

If there are 12 moths and some have 31 days and others have 30 days how many have 28 days?

Solve this system of equations. 12x − 18y = 27 4x − 6y = 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