A substance had a half-life of 16 hours. If the original substance has 105 kg, when will the amount be 5kg? A)70 hours and 18 minutes
B)70 hours
C)18 minutes
D)21 hours

Which is a true statement comparing the graphs of x^2/6^2-y^2/8^2 = 1 and x^2/8^2-y^2/6^2 the foci of both graphs are the same points. the lengths of both transverse axes are the same. the directrices of = 1 are horizontal while the directrices of = 1 are vertical. the vertices of = 1 are on the y-axis while the vertices of = 1 are on the x-axis.

Tom wants to order tickets online so that he and three of his friends can go to a water park the cost of the tickets is 16.00 per person there is also a 2.50 one-time service fee for ordering tickets online write an expression in term of n that represents the cost for n ordering tickets online

What set does not contain -3 the set of all real numbers the set of all integers the set of all whole numbers the set of all rational numbers