If there is 21 marbles in a jar how many marbles would it hold of its full​

Multiplying an even number of negative numbers gives an answer that is choose from:

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

Angle that produces maximum distance