A geological sample is found to have a pb-206/u-238 mass ratio of 0. 337/1. 0. Assuming there was no pb-206 present when the sample was formed, how old is it? the half-life of u-238 is 4. 5 × 109 years.

Late at night some traffic signals change patterns and become ?

All of these sentences include commonly confused homophones. which sentence is correct? you put too much sugar on your breakfast serial. my father grows vegetables and flours in his garden. will someone me untie the knot in my shoelace? when did the captain set sale on his trip to north america?

In the_ work-study program, college students who have financial needs can work part-time jobs to pay for education expenses. a stafford b university c federal d pell