The half-life of Radium-226 is 1590 years. If a sample contains 400 mg, how many mg will remain after 1000 years? Give your answer accurate to 2 decimal places.

What is the equation of the line in point-slope form? y+ 4 = 1/2(x+4) y-4 = 1/2(x + 4) y-0 = 2(x - 4) y-4 = 2(8-0)

Weekly wages at a certain factory are normally distributed with a mean of $400 and a standard deviation of $50. find the probability that a worker selected at random makes between $450 and $500

How do newtons third law of motion demonstrates on a rollar coster