Carbon-14 s a radioactive element with a hai about 5,730 years. Carbon-14 a sad to decay eaponentialy The decayate 14. We are interested in the time (years) it takes to decay carbon-14. Find the percentage of carben14 lasting longer than 15,000 years. (0) Sketch the graph, and shade the area of interest. 1.0 G00014 08 000012 000010 06 0.00008 0.00000 04 0.00004 02 0.00002 5000 10000 15000 20000 3000 10000 13000 20000 0.00014 0.00012 0 00010 0.6 0.00008 0.00006 04 0.00004 0.00002 02 3000 10 000 15000 20000 5000 10000 15000 20 000 (b) Find the probability (Round your answer to four decimal piaces. P IS,000) -

4G ill 01:44 80. Human Memory Model Students in a learning theory study took an exam and then retested monthly for 6 months with an equivalent exam. The data obtained in the study are given by the ordered pairs (r, s), where is the time (in months) after the initial exam and s is the average score for the class. Use the data to find a logarithmic equation that relates / and s. (1, 84.2), (2, 78.4), (3, 72.1), (4,68.5), (5, 67.1), (6, 65.3)

Find the values of a and b

Rate  time(sec) dist(ft)