Radium decays according to the function Q(t) = Qe-
where Q represents the quantity remaining after tyears and k is the decay
constant 0.00043. How long will take for 500g of radium to decay to 5g?

Asays "we are both knaves" and b says nothing. exercises 24–31 relate to inhabitants of an island on which there are three kinds of people: knights who always tell the truth, knaves who always lie, and spies (called normals by smullyan [sm78]) who can either lie or tell the truth. you encounter three people, a, b, and c. you know one of these people is a knight, one is a knave, and one is a spy. each of the three people knows the type of person each of other two is. for each of these situations, if possible, determine whether there is a unique solution and determine who the knave, knight, and spy are. when there is no unique solution, list all possible solutions or state that there are no solutions. 24. a says "c is the knave," b says, "a is the knight," and c says "i am the spy."

Find the solution on the interval [0, 2pi)

What are the solutions of the equation x4 – 5x2 – 14 = 0? use factoring to solve. someone !