What was alex's blood alcohol concentration when he returned to his hotel room at midnight? remember to consider when he started drinking until when he stopped when figuring your calculations?

To calculate blood alcohol concentration, we need to know Josh's gender, body weight, when he started drinking, when he stopped drinking, and how many "standard" drinks of alcohol he drank. Then, we plug this information into the formula:

[(# of standard drinks/2) x (gender constant/body weight (lbs))] - (.017 x hours)

Josh is a male, so the gender constant is .73 (for females, the constant would be .66).
Josh is 172 lbs.
The wedding reception went from 8pm to midnight, so Josh was drinking for 4 hours.
1 martini is close to 2 standard drinks, 1 glass of wine is close to 1.3 standard drinks, 1 glass of champagne is close to 1.4 standard drinks, and 1 tequila shot is close to 1 standard drink. Since Josh had 2 martinis, 3 glasses of wine, 2 glasses of champagne, and 4 tequila shots, he drank about 14.7 standard drinks.

[(14.7/2) x (.73/172)] - (.017 x 4)]
[7.35 x .0042 - .068]
[.03087 - .068] = -.0407

Alex's back is .04%.

answer: carbon 14 can only be used to determine the age of the organisms that were once living, and igneous rocks are non living.

explanation:

carbon 14 dating is used to determine the age of the sample by estimating the amount of carbon 14 present in the sample and then comparing it with a reference standard.carbon 14 is a isotope of carbon which is radioactive and unstable. carbon 14 is assimilated by all plants and animals throughout their life from carbon dioxide. however, one the organisms die they stop this assimilation and the carbon 14 content starts to decrease.by knowing how much of carbon 14 is left in an organism after his death, one can estimate the age of the organism. the materials whose age can be estimated by carbon 14 method are the organic compounds. however, some inorganic compounds such as aragonite   shell can also be dated.however, if we consider the igneous rocks it is a non living component which never accumulated carbon 14 in it and thus, we cannot use carbon 14 dating method to estimate its age.