When a certain rock formed, it contained 12 mg 40k. The rock now contains 3 mg 40k. The half-life of 40k is 1. 3 billion years. How old is the rock?.

In a 2010 article “fact check: eastern u.s. earthquake risk” by chris mould, the author provides as evidence the following statement by the united states geological survey: “although earthquakes may be less frequent in the eastern u.s., … urban areas in the east could face bigger losses because the shaking would affect much larger areas than similar quakes in the west. in addition, most homes and buildings in the east are not designed to withstand earthquakes.”this statement directly relates to which of the following concepts? a. vulnerabilityb. hazardc. riskd. severity

The ratio of the measures of the three angles in a triangle is 14: 15: 11 find the measures of the angles

What could the united states of america do to improve their status? name at least 3(ap human geography)