1. we have 100 earthquake listening stations. an imminent earthquake corresponds to a level 5 measurement. the sample mean is 5.2 with a sample deviation of .7. a warning is issued when we are 95% confident that the average is at least at level 5. do we issue a warning? the tinterval may be the most useful approach in this problem.

assuming you mean addition: addition and subtraction are reverse operations.

step-by-step explanation:

6mm^3 or .6cm^3

      216

      /   \

  36     6

  /   \     /

6     6   6

factor trees are nice.

12r - 8 - 12

you have to combine like terms. below i have bolded the like terms:

12r - 8 - 12

together it combines to:

12r - 20

hope this !