Find the slope of the line

How to find the exponential function y=ca^x, with points (1,2) and (2,1)

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.

Corresponding angles are a. always b. sometimes c. never congruent