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

The temperature of a chemical solution is originally 21 ? c . a chemist heats the solution at a constant rate, and the temperature of the solution 75 ? c after 1212 12 minutes of heating. the temperature, tt t , of the solution in ? c is a function of x , the heating time in minutes. write the function's formula.