college algebra - please help The half-life for thorium-227 is 18.72 days. The amount A (in grams) of thorium-227 after t days for a 10-gram sample is given by A(t)=10⋅0.5^t/18.72 How long will it take before 4 grams of thorium-227 is left in the sample? Round your answer to the hundredths place. _days

What was the main aim of the northwest ordinance of 1787

Sheri likes to study in the school library, but it is usually full of chatting students. it's a great place to study because her friends can always drop by when they want to talk to her. sheri should seek a new study space with a. more light c. less distractions b. less people d. more access to a restroom select the best answer from the choices provided a b c d

How american was colonial art? to what extent does it illustrate the development of a new society