The half-life of radium-226 is 1590 years. If a sample contains 400 mg how many mg will remain after 4000 years?

Afootball quarterback has two more chances to throw a touchdown before his team is forced to punt the ball. he misses the receiver on the first throw 25% of the time. when his first throw is incomplete, he misses the receiver on the second throw 15% of the time. what is the probability of not throwing the ball to a receiver on either throw?

Use the squared identities to simplify sin^2x cos^2x

25 ! what is the value of x? enter your answer in the box. x =