Ten circles are all the same size. Each pair of these circles overlap but no
circle is exactly on top of another circle. What is the greatest possible total number of
intersection points of these ten circles?
(A) 40
(B) 70
(C) 80
(D) 90
(E) 110

Initially 100 milligrams of a radioactive substance was present. after 6 hours the mass had decreased by 4%. if the rate of decay is proportional to the amount of the substance present at time t, find the amount remaining after 24 hours. (round your answer to one decimal place.)

If f(x) = x+8 and g(x) = 4x- 3, find (f+g)(x)

The evening newspaper is delivered at a random time between 5: 30 and 6: 30 pm. dinner is at a random time between 6: 00 and 7: 00 pm. each spinner is spun 30 times and the newspaper arrived 19 times before dinner. determine the experimental probability of the newspaper arriving before dinner.